Sandeep Kumar Maurya

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Education / Work History

• Assistant Professor, Changchun Institute of Optics, Fine Mechanics and Physics · The Guo China-US Photonics Laboratory (present)
• Research Associate at Institute of Advance Energy, Kyoto University, Japan
• Ph.D. Scholar, IIT Kanpur (2014)

Thesis Abstract

Modulation of Nonlinear Optical Properties of Molecules in Condensed Phase with Femtosecond Laser Pulses

My thesis focuses on the study of Nonlinear Optical (NLO) properties of molecules, in particular, on Nonlinear Refraction (NR) and Nonlinear Absorption (NLA) with a special emphasis on Two-photon Absorption (TPA) process. This thesis has been organized into seven chapters. Chapter 1 starts with an introduction to NLO process and a brief theoretical discussion on the different experimental techniques (Z-scan and Two- photon Induced Fluorescence) used for characterization of NLO materials. Subsequently, in Chapter 2, the construction and alignment details of each of the individual optical setups are described. Both the modes of operation of the conventional Z-scan technique, namely, the Close Aperture and the Open Aperture have been used. In Chapter 3, we present the concentration dependent study of Two-photon Induced Fluorescence (TPIF) of Rhodamine dyes using the femtosecond HRR laser pulses at 780 nm. Here we show the accurate quantification of TPA Cross Section (TPACS) for both the dye in methanol solution. We have used a mechanical chopper to solve the pulse pileup due to HRR laser pulses. In this chapter, we also present the study of intermolecular energy transfer between Rhodamine dyes in methanol using TPIF technique where R6G act as a donor and RhB act as an Acceptor. This study shows that re-absorption processes between the dye molecules affect the energy transfer process between them, and it is most evident at higher concentration. Chapter 4 presents spectroscopic study of a cationic dye (R6G) in cationic surfactant, undergoing micelle formation using TPIF technique. This study reveals that there is an increase in the TPIF intensity at CMC, which is in accordance with the enhancement in the absorption intensity of the dye molecule at that point. The mechanism for the enhancement in the TPIF intensity has also been discussed in this chapter. Chapter 5 presents TPA cross-section study of metal ion complexes with Schiff base using femtosecond laser pulses. We correlate the TPA activities of these systems with the properties of metal ions. We also studied Pyrene based Schiff base ligands, which have shown selective sensing capability towards copper ion via enhanced TPA activity. Chapter 6 presents the study of self-defocusing on a series of organic liquids using closed aperture Z-scan technique with femtosecond HRR laser pulses at 780 nm utilizing the thermal load from HRR laser pulses. Results were correlated with their molecular physical properties such as specific heat capacity, dipole moment, density etc. In this chapter, we have also investigated the intermolecular interactions in their binary mixtures under the same experimental conditions In the final chapter, i.e., Chapter 7, experimental observations are presented on how the repetition rate of laser pulse modulate the index of nonlinear refraction in spite of having no observable effect on the nonlinear absorption. Origin of modulation in NR was discussed in addition of determining the thermal decay time periods for the two organic liquids.

Research Topic / Interest

My research interests focus on the nonlinear interaction of intense laser pulses with the molecule in a condensed phase. His core interest is the molecular dynamics associated with complex molecule near interface which involves Charge Separation Process, Electron-Hole Pair Formation, and Surface Plasmon (SP).

Publications

These include only those published in our lab.

1. Decoding Coherent Information in Femtosecond Shaped Laser Pulses. I. Bhattacharyya, A. Dutta, S. Ashtekar, S. K. Maurya, and D. Goswami, CURRENT SCIENCE 99(4), 10 (2010) [Abstract] [BibTeX]

   Abstract: We report here an experimental demonstration of a pulse decoding technique from spectral analysis of femtosecond pulses. This technique is based on a single-step Fourier domain inversion algorithm and shows the impact of the spectral window function on the retrieval of the signal pulse. Using two femtosecond laser pulses at 780 and 1560 nm from a fibre laser, we have shown that even when the spectral content of the reference pulse is far from a narrow band limit (as much as a quarter of its entire spectral content for our conditions), the single-step retrieval analysis using spectral windowing in the Fourier domain works efficiently. The enhanced signal levels possible due to the wider spectral window are critical in the unambiguous description of laser pulses, which would have potential application in the retrieval of comparatively weak and complex ultra-short pulses as is often needed in pulse shaping applications and coherent optical communications.

    BibTeX: @article{bhattacharyyaDecodingCoherentInformation2010,
     title = {Decoding Coherent Information in Femtosecond Shaped Laser Pulses},
     author = {Bhattacharyya, Indrajit and Dutta, Aveek and Ashtekar, Sumit and Maurya, Sandeep Kumar and Goswami, Debabrata},
     date = {2010},
     journaltitle = {CURRENT SCIENCE},
     volume = {99},
     number = {4},
     pages = {10}
   }
   

2. Synthesis, Structure, and Two-Photon Absorption Studies of a Phosphorus-Based Tris Hydrazone Ligand (S)P[N(Me)N═CH-C6H3-2-OH-4-N(CH2CH3)2]3 and Its Metal Complexes. V. Chandrasekhar, R. Azhakar, B. Murugesapandian, T. Senapati, P. Bag, M. D. Pandey, S. K. Maurya, and D. Goswami, Inorganic Chemistry 49(9), 4008–4016 (2010) [Abstract] [PDF] [BibTeX]

   Abstract: A phosphorus-supported multidentate ligand (S)P[N(Me)N═CH-C6H3-2-OH-4-N(CH 2CH3)2]3 (1) has been used to prepare mononuclear complexes LM [M = Fe (2) Co (3)] and trinuclear complexes L2M3 [M = Mn (4), Ni (5), Zn (6), Mg (7), Cd (8)]. In both 2 and 3 the ligand binds the metal ion in a facial coordination mode utilizing three imino nitrogen (3N) and three phenolic oxygen (3O) atoms. The molecular structures of L2Mn3, L2Ni3, L2Zn3, L2Mg3, and L2Cd3 (4−8) are similar; two trihydrazone ligands are involved in coordination to hold the three metal ions in a linear fashion. Each of the trishydrazone ligands behaves as a trianionic hexadentate ligand providing three imino and three phenolic oxygen atoms for coordination to the metal ions. The coordination environment around the two terminal metal ions is similar (3N, 3O) while the central metal ion has a 6O coordination environment. Third-order non-linear optical properties of these compounds as measured by their two-photon absorption (TPA) cross section reveals that while 1 does not possess obvious TPA activity, complexes 2 (3213 GM) and 4 (3516 GM) possess a large TPA cross section at 770 nm.

    BibTeX: @article{chandrasekharSynthesisStructureTwoPhoton2010,
     title = {Synthesis, {{Structure}}, and {{Two-Photon Absorption Studies}} of a {{Phosphorus-Based Tris Hydrazone Ligand}} ({{S}}){{P}}[{{N}}({{Me}}){{N}}═{{CH-C6H3-2-OH-4-N}}({{CH2CH3}})2]3 and {{Its Metal Complexes}}},
     author = {Chandrasekhar, Vadapalli and Azhakar, Ramachandran and Murugesapandian, Balasubramanian and Senapati, Tapas and Bag, Prasenjit and Pandey, Mrituanjay D. and Maurya, Sandeep Kumar and Goswami, Debabrata},
     date = {2010-05-03},
     journaltitle = {Inorganic Chemistry},
     shortjournal = {Inorg. Chem.},
     volume = {49},
     number = {9},
     pages = {4008--4016},
     issn = {0020-1669},
     doi = {10/bvqgfp},
     url = {https://doi.org/10.1021/ic901531e},
     urldate = {2019-08-14}
   }
   

3. Two-Photon-Absorption Technique for Selective Detection of Copper(II) Ions in Aqueous Solution Using a Dansyl–Pyrene Conjugate. V. Chandrasekhar, M. D. Pandey, S. K. Maurya, P. Sen, and D. Goswami, Chemistry – An Asian Journal 6(9), 2246–2250 (2011) [Abstract] [PDF] [BibTeX]

   Abstract: Rhythm is a dansyl: A novel dansyl–pyrene conjugate functions as a fluorescence signaling unit showing strong fluorescence quenching upon interaction with copper(II) metal ions. On the other hand, the two-photon absorption (TPA) cross-section increased from 374 to 3022 GM (at 770 nm) upon interaction with copper(II) ions, thus allowing their selective detection in aqueous solutions.

    BibTeX: @article{chandrasekharTwoPhotonAbsorptionTechniqueSelective2011,
     title = {Two-{{Photon-Absorption Technique}} for {{Selective Detection}} of {{Copper}}({{II}}) {{Ions}} in {{Aqueous Solution Using}} a {{Dansyl}}–{{Pyrene Conjugate}}},
     author = {Chandrasekhar, Vadapalli and Pandey, Mrituanjay D. and Maurya, Sandeep Kumar and Sen, Pratik and Goswami, Debabrata},
     date = {2011},
     journaltitle = {Chemistry – An Asian Journal},
     volume = {6},
     number = {9},
     pages = {2246--2250},
     issn = {1861-471X},
     doi = {10/c5ft2w},
     url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/asia.201100032},
     urldate = {2019-08-02}
   }
   

4. An Efficient Nanocomposite Based on Carbon Nanotubes Functionalized with a Fluorescent Ink for Ultrafast Optical Limiting. J. Gupta, C. Vijayan, S. K. Maurya, and D. Goswami, Materials Letters 65(5), 915–917 (2011) [Abstract] [PDF] [BibTeX]

   Abstract: Functionalization of CNTs with different kinds of molecules is known to alter the optical properties of CNTs, leading to the development of new nanocomposites of interest to optoelctronics. This paper presents the design of a new and efficient optical limiting material based on carbon nanotubes (CNTs) functionalized with a commercial fluorescent ink. High resolution transmission electron microscopy (HRTEM) and optical spectroscopy indicate that the ink molecules get noncovalently attached to the surface of the CNTs. The mechanism of optical nonlinearity of the CNTs gets modified after functionalization. Z-scan studies on functionalized CNTs performed using mode-locked Ti:Sapphire femtosecond pulses at 780nm reveal the predominance of two photon absorption (TPA). Efficient and low threshold ultrafast optical limiting is demonstrated in the new nanocomposite.

    BibTeX: @article{guptaEfficientNanocompositeBased2011,
     title = {An Efficient Nanocomposite Based on Carbon Nanotubes Functionalized with a Fluorescent Ink for Ultrafast Optical Limiting},
     author = {Gupta, Jyotsana and Vijayan, C. and Maurya, Sandeep Kumar and Goswami, D.},
     date = {2011-03-15},
     journaltitle = {Materials Letters},
     shortjournal = {Materials Letters},
     volume = {65},
     number = {5},
     pages = {915--917},
     issn = {0167-577X},
     doi = {10/cd5dqh},
     url = {http://www.sciencedirect.com/science/article/pii/S0167577X10010554},
     urldate = {2019-08-13}
   }
   

5. Efficient Ultrafast Optical Limiting Using Single Walled Carbon Nanotubes Functionalized Noncovalently with Free Base and Metalloporphyrins. J. Gupta, C. Vijayan, S. K. Maurya, and D. Goswami, Journal of Applied Physics 109(11), 113101 (2011) [Abstract] [PDF] [BibTeX]

   Abstract: The present work is on the linear and third order nonlinear optical properties of single walled carbon nanotubes functionalized noncovalently with free base porphyrin and a metalloporphyrin separately. The functionalized carbon nanotubes (CNTs) are soluble in dimethylformamide, and the microscopic images show that the porphyrin molecules are attached to the surface of the CNTs. The interaction between CNTs and porphyrins is noncovalent and probably due to π-π interaction as both CNTs and porphyrins have π-electron rich structures. The samples exhibit large ultrafast nonlinear absorption as evident from the open aperture z-scan studies performed using mode-locked Ti:Sapphire femtosecond pulses at 780 nm. The mechanisms of optical nonlinearity of the functionalized CNTs appear to be two photon absorption along with nonlinear scattering with a small contribution from saturable absorption, whereas nonfunctionalized CNTs are known to exhibit saturable absorption. The value of the nonlinear absorption coefficient for the CNTs functionalized with the free base porphyrin is one order smaller than that for CNTs functionalized with metalloporphyrin. Efficient low threshold ultrafast optical limiting is demonstrated for both types of functionalized CNTs.

    BibTeX: @article{guptaEfficientUltrafastOptical2011,
     title = {Efficient Ultrafast Optical Limiting Using Single Walled Carbon Nanotubes Functionalized Noncovalently with Free Base and Metalloporphyrins},
     author = {Gupta, Jyotsana and Vijayan, C. and Maurya, Sandeep Kumar and Goswami, D.},
     date = {2011-06},
     journaltitle = {Journal of Applied Physics},
     shortjournal = {Journal of Applied Physics},
     volume = {109},
     number = {11},
     pages = {113101},
     issn = {0021-8979, 1089-7550},
     doi = {10/cx5v4x},
     url = {http://aip.scitation.org/doi/10.1063/1.3587178},
     urldate = {2019-08-13}
   }
   

6. Nonlinear Optical Response of Carbon Nanotubes Functionalized with a Water Soluble Ink. J. Gupta, given-i=P. C. family=Vijayan given=Prof. C., S. Maurya, and D. Goswami, in (2008) [BibTeX]

    BibTeX: @inproceedings{guptaNonlinearOpticalResponse2008,
     title = {Nonlinear Optical Response of Carbon Nanotubes Functionalized with a Water Soluble Ink},
     author = {Gupta, Jyotsana and family=Vijayan, given=Prof. C., given-i={{Prof}}C and Maurya, Sandeep and Goswami, Debabrata},
     date = {2008-12-01}
   }
   

7. Ultrafast Nonlinear Optical Response of Carbon Nanotubes Functionalized with Water Soluble Porphyrin. J. Gupta, C. Vijayan, S. K. Maurya, and D. Goswami, Optics Communications 285(7), 1920–1924 (2012) [Abstract] [PDF] [BibTeX]

   Abstract: A new nanocomposite is obtained by functionalizing carbon nanotubes (CNTs) with a water soluble metalloprophyrin using a simple chemical technique and characterized by optical absorption, IR, and Raman spectroscopy. Results from spectroscopic studies indicate the noncovalent nature of interaction between CNTs and porphyrin. The ultrafast nonlinear response is characterized by measuring the nonlinear absorption coefficient and refractive index by z-scan technique in the femtosecond pulse regime. The nanocomposite is found to exhibit two-photon absorption (TPA) with a reasonably large nonlinear optical coefficient, whereas pure CNTs is known to exhibit saturable absorption. Design of such water soluble nanocomposites offers scope for obtaining materials with enhanced ultrafast optical nonlinearity.

    BibTeX: @article{guptaUltrafastNonlinearOptical2012,
     title = {Ultrafast Nonlinear Optical Response of Carbon Nanotubes Functionalized with Water Soluble Porphyrin},
     author = {Gupta, Jyotsana and Vijayan, C. and Maurya, Sandeep Kumar and Goswami, D.},
     date = {2012-04-01},
     journaltitle = {Optics Communications},
     shortjournal = {Optics Communications},
     volume = {285},
     number = {7},
     pages = {1920--1924},
     issn = {0030-4018},
     doi = {10/fzw9zm},
     url = {http://www.sciencedirect.com/science/article/pii/S0030401811014532},
     urldate = {2019-08-02}
   }
   

8. Concentration Dependent Approach for Accurate Determination of Two-Photon Absorption Cross-Section of Fluorescent Dye Molecule. S. K. Maurya, C. Dutta, and D. Goswami, Journal of Fluorescence 27(4), 1399–1403 (2017) [Abstract] [PDF] [BibTeX]

   Abstract: We have investigated the concentration dependent of two-photon induced fluorescence (TPIF) in methanolic solution of Rhodamine 6G and Rhodamine B dye using 120 fs laser pulses at 780 nm, 76 MHz repetition rate. TPIF study of these dyes was compared with their respective one photon fluorescence intensity. We have shown the effect of chopper on TPIF intensity from Rhodamine dyes, which have shown direct influence on the determined TPA Cross section of these dyes.

    BibTeX: @article{mauryaConcentrationDependentApproach2017,
     title = {Concentration {{Dependent Approach}} for {{Accurate Determination}} of {{Two-Photon Absorption Cross-Section}} of {{Fluorescent}} Dye {{Molecule}}},
     author = {Maurya, Sandeep Kumar and Dutta, Chayan and Goswami, Debabrata},
     date = {2017-07-01},
     journaltitle = {Journal of Fluorescence},
     shortjournal = {J Fluoresc},
     volume = {27},
     number = {4},
     pages = {1399--1403},
     issn = {1573-4994},
     doi = {10/gf5mq7},
     url = {https://doi.org/10.1007/s10895-017-2076-4},
     urldate = {2019-08-01}
   }
   

9. Effect of Femtosecond Laser Pulse Repetition Rate on Nonlinear Optical Properties of Organic Liquids. S. K. Maurya, D. Yadav, and D. Goswami, PeerJ Physical Chemistry 1, e1 (2019) [Abstract] [PDF] [BibTeX]

   Abstract: The effect of the repetition rate of femtosecond laser pulses on the two-photon absorption and nonlinear refraction of pure organic liquids is presented using the conventional Z-scan technique. Such a study provides a way to determine the nature of light-matter interaction, explicitly enabling the identification of the linear versus nonlinear regimes. Based on the type of light-matter interaction, we have identified the thermal load dissipation time for the organic liquids. Our experimental results are in good agreement with the theoretically calculated decay time for the dissipation of thermal load.

    BibTeX: @article{mauryaEffectFemtosecondLaser2019,
     title = {Effect of Femtosecond Laser Pulse Repetition Rate on Nonlinear Optical Properties of Organic Liquids},
     author = {Maurya, Sandeep Kumar and Yadav, Dheerendra and Goswami, Debabrata},
     date = {2019-10-15},
     journaltitle = {PeerJ Physical Chemistry},
     volume = {1},
     pages = {e1},
     doi = {10/ggbzhh},
     url = {https://peerj.com/articles/pchem-1},
     urldate = {2019-10-29}
   }
   

10. Investigating Two-Photon-Induced Fluorescence in Rhodamine-6G in Presence of Cetyl-Trimethyl-Ammonium-Bromide. S. K. Maurya, D. Yadav, and D. Goswami, Journal of Fluorescence 26(5), 1573–1577 (2016) [Abstract] [PDF] [BibTeX]

    Abstract: We investigate the effect of cetyl-trimethyl-ammonium-bromides (CTAB) concentration on the fluorescence of Rhodamine-6G in water. This spectroscopic study of Rhodamine-6G in presence of CTAB was performed using two-photon-induced-fluorescence at 780 nm wavelength using high repetition rate femtosecond laser pulses. We report an increment of ∼10 % in the fluorescence in accordance with ∼12 % enhancement in the absorption intensity of the dye molecule around the critical micellar concentration. We discuss the possible mechanism for the enhancement in the two-photon fluorescence intensity and the importance of critical micellar concentration.

     BibTeX: @article{mauryaInvestigatingTwoPhotonInducedFluorescence2016,
      title = {Investigating {{Two-Photon-Induced Fluorescence}} in {{Rhodamine-6G}} in {{Presence}} of {{Cetyl-Trimethyl-Ammonium-Bromide}}},
      author = {Maurya, Sandeep Kumar and Yadav, Dheerendra and Goswami, Debabrata},
      date = {2016-09-01},
      journaltitle = {Journal of Fluorescence},
      shortjournal = {J Fluoresc},
      volume = {26},
      number = {5},
      pages = {1573--1577},
      issn = {1573-4994},
      doi = {10/f82q4x},
      url = {https://doi.org/10.1007/s10895-016-1841-0},
      urldate = {2019-08-01}
    }
    

11. Probing Intermolecular Interactions in Binary Liquid Mixtures Using Femtosecond Laser-Induced Self-Defocusing. S. K. Maurya, D. Das, and D. Goswami, Applied Spectroscopy 70(10), 1655–1661 (2016) [Abstract] [PDF] [BibTeX]

    Abstract: Photothermal behavior of binary liquid mixtures has been studied using a high repetition rate (HRR) Z-scan technique with femtosecond laser pulses. Changes in the peak–valley difference in transmittance (ΔTP–V) for closed aperture Z-scan experiments are indicative of thermal effects induced by HRR femtosecond laser pulses. We show such indicative results can have a far-reaching impact on molecular properties and intermolecular interactions in binary liquid mixtures. Spectroscopic parameters derived from this experimental technique show that the combined effect of physical and molecular properties of the constituent binary liquids can be related to the components of the binary liquid.

     BibTeX: @article{mauryaProbingIntermolecularInteractions2016,
      title = {Probing {{Intermolecular Interactions}} in {{Binary Liquid Mixtures Using Femtosecond Laser-Induced Self-Defocusing}}},
      author = {Maurya, Sandeep Kumar and Das, Dhiman and Goswami, Debabrata},
      date = {2016-10-01},
      journaltitle = {Applied Spectroscopy},
      shortjournal = {Appl Spectrosc},
      volume = {70},
      number = {10},
      pages = {1655--1661},
      issn = {0003-7028},
      doi = {10/gf5mrx},
      url = {https://doi.org/10.1177/0003702816643547},
      urldate = {2019-08-01}
    }
    

12. Study of Self Defocusing in Liquids Using Single Beam Z-scan with High Repetition Rate Laser Pulses. S. K. Maurya, S. Singhal, and D. Goswami, in International Conference on Fibre Optics and Photonics (OSA, 2012), p. TPo.44 [Abstract] [PDF] [BibTeX]

    Abstract: We report the behavior of nonlinear refraction property of solvent using femtosecond high repetition rate laser pulses with close aperture z scan technique. Self defocusing due to HRR pulses highly depend on viscosity and density of the systems.

     BibTeX: @inproceedings{mauryaStudySelfDefocusing2012,
      title = {Study of Self Defocusing in Liquids Using Single Beam {{Z-scan}} with {{High}} Repetition Rate Laser Pulses},
      booktitle = {International {{Conference}} on {{Fibre Optics}} and {{Photonics}}},
      author = {Maurya, Sandeep Kumar and Singhal, Sumit and Goswami, Debabrata},
      date = {2012},
      pages = {TPo.44},
      publisher = {{OSA}},
      location = {{Chennai}},
      doi = {10/gf5nqb},
      url = {https://www.osapublishing.org/abstract.cfm?URI=Photonics-2012-TPo.44},
      urldate = {2019-08-02},
      eventtitle = {International {{Conference}} on {{Fibre Optics}} and {{Photonics}}}
    }
    

13. Two-Photon Absorption Cross Sections in a Dual-Signaling Ferrocene Pyrene Conjugate. M. D. Pandey, S. K. Maurya, D. Goswami, M. A. Wani, and R. Pandey, 2 (2016) [Abstract] [BibTeX]

    Abstract: We report a ferrocene-pyrene conjugate (1) as an electroactive and photoactive signaling units. Copper mediated system selectively shows highly two-photon absorption activity 1230 GM at 780 nm, in contrast to strong one-photon fluorescence quenching.

     BibTeX: @article{pandeyTwophotonAbsorptionCross2016,
      title = {Two-Photon Absorption Cross Sections in a Dual-Signaling Ferrocene Pyrene Conjugate},
      author = {Pandey, Mrituanjay D and Maurya, Sandeep Kumar and Goswami, Debabrata and Wani, Manzoor Ahmad and Pandey, Rampal},
      date = {2016},
      pages = {2},
      doi = {10/gf8pjt}
    }
    

14. Graphene Oxide from Silk Cocoon: A Novel Magnetic Fluorophore for Multi-Photon Imaging. M. Roy, T. S. Kusurkar, S. K. Maurya, S. K. Meena, S. K. Singh, N. Sethy, K. Bhargava, R. K. Sharma, D. Goswami, S. Sarkar, and M. Das, 3 Biotech 4(1), 67–75 (2014) [Abstract] [PDF] [BibTeX]

    Abstract: In this work, we synthesized graphene oxide from silk cocoon embarking its new dimension as a magnetic fluorophore when compared with its present technical status, which at best is for extracting silk as a biomaterial for tissue engineering applications. We produced graphene oxide by pyrolysing the silk cocoon in an inert atmosphere. The collected raw carbon is oxidized by nitric acid that readily produces multilayer graphene oxide with nano carbon particulates. Structural properties of the graphene oxide were analyzed using scanning electron microscopy, transmission electron microscopy, Fourier transform infra-red spectroscopy, and Raman spectroscopy. The oxidized sample shows remarkable fluorescence, multi-photon imaging and magnetic properties. On increasing the excitation wavelength, the fluorescence emission intensity of the graphene oxide also increases and found maximum emission at 380 nm excitation wavelength. On studying the two photon absorption (TPA) property of aqueous graphene oxide using Z-scan technique, we found significant TPA activity at near infrared wavelength. In addition, the graphene oxide shows ferromagnetic behavior at room temperature. The observed fluorescence and magnetic property were attributed to the defects caused in the graphene oxide structure by introducing oxygen containing hydrophilic groups during the oxidation process. Previously silk cocoon has been used extensively in deriving silk-based tissue engineering materials and as gas filter. Here we show a novel application of silk cocoon by synthesizing graphene oxide based magnetic-fluorophore for bio-imaging applications.

     BibTeX: @article{royGrapheneOxideSilk2014,
      title = {Graphene Oxide from Silk Cocoon: A Novel Magnetic Fluorophore for Multi-Photon Imaging},
      shorttitle = {Graphene Oxide from Silk Cocoon},
      author = {Roy, Manas and Kusurkar, Tejas Sanjeev and Maurya, Sandeep Kumar and Meena, Sunil Kumar and Singh, Sushil Kumar and Sethy, Niroj and Bhargava, Kalpana and Sharma, Raj Kishore and Goswami, Debabrata and Sarkar, Sabyasachi and Das, Mainak},
      date = {2014-02-01},
      journaltitle = {3 Biotech},
      shortjournal = {3 Biotech},
      volume = {4},
      number = {1},
      pages = {67--75},
      issn = {2190-5738},
      doi = {10/gcb6qh},
      url = {https://doi.org/10.1007/s13205-013-0128-2},
      urldate = {2019-08-02}
    }
    

15. A Dual-Signaling Ferrocene-Pyrene Dyad: Triple-Mode Recognition of the Cu(II) Ions in Aqueous Medium. M. A. Wani, M. D. Pandey, R. Pandey, S. K. Maurya, and D. Goswami, Journal of Fluorescence 27(6), 2279–2286 (2017) [Abstract] [PDF] [BibTeX]

    Abstract: We report a structure of ferrocene-pyrene conjugate (1) comprising electro and photo-active dual-signaling units. In particular, 1 upon interaction with Cu(II), displays selectively one-photon fluorescence quenching, but it shows two-photon absorption (TPA) cross-section 1230 GM (at 780 nm). Further, 1 displayed two irreversible oxidative waves at 0.39 V and 0.80 V (vs Ag/AgCl), in the electrochemical analysis which upon addition of Cu2+, led to the negative potential shift in both the oxidative waves to appear at 0.25 V and 0.68 V. The triple mode changes in presence of Cu(II) suggesting the possible application of 1 for the detection of Cu(II) in aqueous media. Open image in new window Graphical Abstract

     BibTeX: @article{waniDualSignalingFerrocenePyreneDyad2017,
      title = {A {{Dual-Signaling Ferrocene-Pyrene Dyad}}: {{Triple-Mode Recognition}} of the {{Cu}}({{II}}) {{Ions}} in {{Aqueous Medium}}},
      shorttitle = {A {{Dual-Signaling Ferrocene-Pyrene Dyad}}},
      author = {Wani, Manzoor Ahmad and Pandey, Mrituanjay D. and Pandey, Rampal and Maurya, Sandeep Kumar and Goswami, Debabrata},
      date = {2017-11-01},
      journaltitle = {Journal of Fluorescence},
      shortjournal = {J Fluoresc},
      volume = {27},
      number = {6},
      pages = {2279--2286},
      issn = {1573-4994},
      doi = {10/gch5h7},
      url = {https://doi.org/10.1007/s10895-017-2169-0},
      urldate = {2019-08-01}
    }
    

16. Nonlinear Optical Response of Carbon Nanotubes Functionalized with a Water Soluble Ink. J. Gupta, P. C. Vijayan, S. Maurya, and D. Goswami, in (2008) [BibTeX]

     BibTeX: @inproceedings{guptaNonlinearOpticalResponse2009,
      title = {Nonlinear Optical Response of Carbon Nanotubes Functionalized with a Water Soluble Ink},
      date = {2008-12-01},
      author = {Gupta, Jyotsana and Vijayan, Prof. C. and Maurya, Sandeep and Goswami, Debabrata}
    }
    

17. A Dual-Signaling Ferrocene-Pyrene Dyad: Triple-Mode Recognition of the Cu(II) Ions in Aqueous Medium. M. A. Wani, M. D. Pandey, R. Pandey, S. K. Maurya, and D. Goswami, J Fluoresc 27(6), 2279–2286 (2017) [Abstract] [PDF] [BibTeX]

    Abstract: We report a structure of ferrocene-pyrene conjugate (1) comprising electro and photo-active dual-signaling units. In particular, 1 upon interaction with Cu(II), displays selectively one-photon fluorescence quenching, but it shows two-photon absorption (TPA) cross-section 1230 GM (at 780 nm). Further, 1 displayed two irreversible oxidative waves at 0.39 V and 0.80 V (vs Ag/AgCl), in the electrochemical analysis which upon addition of Cu2+, led to the negative potential shift in both the oxidative waves to appear at 0.25 V and 0.68 V. The triple mode changes in presence of Cu(II) suggesting the possible application of 1 for the detection of Cu(II) in aqueous media. Open image in new window Graphical Abstract

     BibTeX: @article{waniDualSignalingFerrocenePyreneDyad2018,
      langid = {english},
      title = {A {{Dual}}-{{Signaling Ferrocene}}-{{Pyrene Dyad}}: {{Triple}}-{{Mode Recognition}} of the {{Cu}}({{II}}) {{Ions}} in {{Aqueous Medium}}},
      volume = {27},
      issn = {1573-4994},
      url = {https://doi.org/10.1007/s10895-017-2169-0},
      doi = {10/gch5h7},
      shorttitle = {A {{Dual}}-{{Signaling Ferrocene}}-{{Pyrene Dyad}}},
      number = {6},
      journaltitle = {J Fluoresc},
      urldate = {2019-08-01},
      date = {2017-11-01},
      pages = {2279-2286},
      author = {Wani, Manzoor Ahmad and Pandey, Mrituanjay D. and Pandey, Rampal and Maurya, Sandeep Kumar and Goswami, Debabrata}
    }
    

18. Concentration Dependent Approach for Accurate Determination of Two-Photon Absorption Cross-Section of Fluorescent Dye Molecule. S. K. Maurya, C. Dutta, and D. Goswami, J Fluoresc 27(4), 1399–1403 (2017) [Abstract] [PDF] [BibTeX]

    Abstract: We have investigated the concentration dependent of two-photon induced fluorescence (TPIF) in methanolic solution of Rhodamine 6G and Rhodamine B dye using 120 fs laser pulses at 780 nm, 76 MHz repetition rate. TPIF study of these dyes was compared with their respective one photon fluorescence intensity. We have shown the effect of chopper on TPIF intensity from Rhodamine dyes, which have shown direct influence on the determined TPA Cross section of these dyes.

     BibTeX: @article{mauryaConcentrationDependentApproach2018,
      langid = {english},
      title = {Concentration {{Dependent Approach}} for {{Accurate Determination}} of {{Two}}-{{Photon Absorption Cross}}-{{Section}} of {{Fluorescent}} Dye {{Molecule}}},
      volume = {27},
      issn = {1573-4994},
      url = {https://doi.org/10.1007/s10895-017-2076-4},
      doi = {10/gf5mq7},
      number = {4},
      journaltitle = {J Fluoresc},
      urldate = {2019-08-01},
      date = {2017-07-01},
      pages = {1399-1403},
      author = {Maurya, Sandeep Kumar and Dutta, Chayan and Goswami, Debabrata}
    }
    

19. Two-Photon Absorption Cross Sections in a Dual-Signaling Ferrocene Pyrene Conjugate. M. D. Pandey, S. K. Maurya, D. Goswami, M. A. Wani, and R. Pandey, 2 (2016) [Abstract] [BibTeX]

    Abstract: We report a ferrocene-pyrene conjugate (1) as an electroactive and photoactive signaling units. Copper mediated system selectively shows highly two-photon absorption activity 1230 GM at 780 nm, in contrast to strong one-photon fluorescence quenching.

     BibTeX: @article{pandeyTwophotonAbsorptionCross2017,
      langid = {english},
      title = {Two-Photon Absorption Cross Sections in a Dual-Signaling Ferrocene Pyrene Conjugate},
      doi = {10.1364/PHOTONICS.2016.Tu2D.2},
      date = {2016},
      pages = {2},
      author = {Pandey, Mrituanjay D and Maurya, Sandeep Kumar and Goswami, Debabrata and Wani, Manzoor Ahmad and Pandey, Rampal}
    }
    

20. Probing Intermolecular Interactions in Binary Liquid Mixtures Using Femtosecond Laser-Induced Self-Defocusing. S. K. Maurya, D. Das, and D. Goswami, Appl Spectrosc 70(10), 1655–1661 (2016) [Abstract] [PDF] [BibTeX]

    Abstract: Photothermal behavior of binary liquid mixtures has been studied using a high repetition rate (HRR) Z-scan technique with femtosecond laser pulses. Changes in the peak–valley difference in transmittance (ΔTP–V) for closed aperture Z-scan experiments are indicative of thermal effects induced by HRR femtosecond laser pulses. We show such indicative results can have a far-reaching impact on molecular properties and intermolecular interactions in binary liquid mixtures. Spectroscopic parameters derived from this experimental technique show that the combined effect of physical and molecular properties of the constituent binary liquids can be related to the components of the binary liquid.

     BibTeX: @article{mauryaProbingIntermolecularInteractions2017,
      langid = {english},
      title = {Probing {{Intermolecular Interactions}} in {{Binary Liquid Mixtures Using Femtosecond Laser}}-{{Induced Self}}-{{Defocusing}}},
      volume = {70},
      issn = {0003-7028},
      url = {https://doi.org/10.1177/0003702816643547},
      doi = {10/gf5mrx},
      number = {10},
      journaltitle = {Appl Spectrosc},
      urldate = {2019-08-01},
      date = {2016-10-01},
      pages = {1655-1661},
      author = {Maurya, Sandeep Kumar and Das, Dhiman and Goswami, Debabrata}
    }
    

21. Investigating Two-Photon-Induced Fluorescence in Rhodamine-6G in Presence of Cetyl-Trimethyl-Ammonium-Bromide. S. K. Maurya, D. Yadav, and D. Goswami, J Fluoresc 26(5), 1573–1577 (2016) [Abstract] [PDF] [BibTeX]

    Abstract: We investigate the effect of cetyl-trimethyl-ammonium-bromides (CTAB) concentration on the fluorescence of Rhodamine-6G in water. This spectroscopic study of Rhodamine-6G in presence of CTAB was performed using two-photon-induced-fluorescence at 780 nm wavelength using high repetition rate femtosecond laser pulses. We report an increment of ∼10 % in the fluorescence in accordance with ∼12 % enhancement in the absorption intensity of the dye molecule around the critical micellar concentration. We discuss the possible mechanism for the enhancement in the two-photon fluorescence intensity and the importance of critical micellar concentration.

     BibTeX: @article{mauryaInvestigatingTwoPhotonInducedFluorescence2017,
      langid = {english},
      title = {Investigating {{Two}}-{{Photon}}-{{Induced Fluorescence}} in {{Rhodamine}}-{{6G}} in {{Presence}} of {{Cetyl}}-{{Trimethyl}}-{{Ammonium}}-{{Bromide}}},
      volume = {26},
      issn = {1573-4994},
      url = {https://doi.org/10.1007/s10895-016-1841-0},
      doi = {10/f82q4x},
      number = {5},
      journaltitle = {J Fluoresc},
      urldate = {2019-08-01},
      date = {2016-09-01},
      pages = {1573-1577},
      author = {Maurya, Sandeep Kumar and Yadav, Dheerendra and Goswami, Debabrata}
    }
    

22. Graphene Oxide from Silk Cocoon: A Novel Magnetic Fluorophore for Multi-Photon Imaging. M. Roy, T. S. Kusurkar, S. K. Maurya, S. K. Meena, S. K. Singh, N. Sethy, K. Bhargava, R. K. Sharma, D. Goswami, S. Sarkar, and M. Das, 3 Biotech 4(1), 67–75 (2014) [Abstract] [PDF] [BibTeX]

    Abstract: In this work, we synthesized graphene oxide from silk cocoon embarking its new dimension as a magnetic fluorophore when compared with its present technical status, which at best is for extracting silk as a biomaterial for tissue engineering applications. We produced graphene oxide by pyrolysing the silk cocoon in an inert atmosphere. The collected raw carbon is oxidized by nitric acid that readily produces multilayer graphene oxide with nano carbon particulates. Structural properties of the graphene oxide were analyzed using scanning electron microscopy, transmission electron microscopy, Fourier transform infra-red spectroscopy, and Raman spectroscopy. The oxidized sample shows remarkable fluorescence, multi-photon imaging and magnetic properties. On increasing the excitation wavelength, the fluorescence emission intensity of the graphene oxide also increases and found maximum emission at 380 nm excitation wavelength. On studying the two photon absorption (TPA) property of aqueous graphene oxide using Z-scan technique, we found significant TPA activity at near infrared wavelength. In addition, the graphene oxide shows ferromagnetic behavior at room temperature. The observed fluorescence and magnetic property were attributed to the defects caused in the graphene oxide structure by introducing oxygen containing hydrophilic groups during the oxidation process. Previously silk cocoon has been used extensively in deriving silk-based tissue engineering materials and as gas filter. Here we show a novel application of silk cocoon by synthesizing graphene oxide based magnetic-fluorophore for bio-imaging applications.

     BibTeX: @article{royGrapheneOxideSilk2015,
      langid = {english},
      title = {Graphene Oxide from Silk Cocoon: A Novel Magnetic Fluorophore for Multi-Photon Imaging},
      volume = {4},
      issn = {2190-5738},
      url = {https://doi.org/10.1007/s13205-013-0128-2},
      doi = {10/gcb6qh},
      shorttitle = {Graphene Oxide from Silk Cocoon},
      number = {1},
      journaltitle = {3 Biotech},
      urldate = {2019-08-02},
      date = {2014-02-01},
      pages = {67-75},
      author = {Roy, Manas and Kusurkar, Tejas Sanjeev and Maurya, Sandeep Kumar and Meena, Sunil Kumar and Singh, Sushil Kumar and Sethy, Niroj and Bhargava, Kalpana and Sharma, Raj Kishore and Goswami, Debabrata and Sarkar, Sabyasachi and Das, Mainak}
    }
    

23. Study of Self Defocusing in Liquids Using Single Beam Z-Scan with High Repetition Rate Laser Pulses. S. K. Maurya, S. Singhal, and D. Goswami, in International Conference on Fibre Optics and Photonics (OSA, 2012), p. TPo.44 [Abstract] [PDF] [BibTeX]

    Abstract: We report the behavior of nonlinear refraction property of solvent using femtosecond high repetition rate laser pulses with close aperture z scan technique. Self defocusing due to HRR pulses highly depend on viscosity and density of the systems.

     BibTeX: @inproceedings{mauryaStudySelfDefocusing2013,
      langid = {english},
      location = {{Chennai}},
      title = {Study of Self Defocusing in Liquids Using Single Beam {{Z}}-Scan with {{High}} Repetition Rate Laser Pulses},
      url = {https://www.osapublishing.org/abstract.cfm?URI=Photonics-2012-TPo.44},
      doi = {10/gf5nqb},
      eventtitle = {International {{Conference}} on {{Fibre Optics}} and {{Photonics}}},
      booktitle = {International {{Conference}} on {{Fibre Optics}} and {{Photonics}}},
      publisher = {{OSA}},
      urldate = {2019-08-02},
      date = {2012},
      pages = {TPo.44},
      author = {Maurya, Sandeep Kumar and Singhal, Sumit and Goswami, Debabrata}
    }
    

24. Ultrafast Nonlinear Optical Response of Carbon Nanotubes Functionalized with Water Soluble Porphyrin. J. Gupta, C. Vijayan, S. K. Maurya, and D. Goswami, Optics Communications 285(7), 1920–1924 (2012) [Abstract] [PDF] [BibTeX]

    Abstract: A new nanocomposite is obtained by functionalizing carbon nanotubes (CNTs) with a water soluble metalloprophyrin using a simple chemical technique and characterized by optical absorption, IR, and Raman spectroscopy. Results from spectroscopic studies indicate the noncovalent nature of interaction between CNTs and porphyrin. The ultrafast nonlinear response is characterized by measuring the nonlinear absorption coefficient and refractive index by z-scan technique in the femtosecond pulse regime. The nanocomposite is found to exhibit two-photon absorption (TPA) with a reasonably large nonlinear optical coefficient, whereas pure CNTs is known to exhibit saturable absorption. Design of such water soluble nanocomposites offers scope for obtaining materials with enhanced ultrafast optical nonlinearity.

     BibTeX: @article{guptaUltrafastNonlinearOptical2013,
      title = {Ultrafast Nonlinear Optical Response of Carbon Nanotubes Functionalized with Water Soluble Porphyrin},
      volume = {285},
      issn = {0030-4018},
      url = {http://www.sciencedirect.com/science/article/pii/S0030401811014532},
      doi = {10.1016/j.optcom.2011.12.070},
      number = {7},
      journaltitle = {Optics Communications},
      urldate = {2019-08-02},
      date = {2012-04-01},
      pages = {1920-1924},
      author = {Gupta, Jyotsana and Vijayan, C. and Maurya, Sandeep Kumar and Goswami, D.}
    }
    

25. Two-Photon-Absorption Technique for Selective Detection of Copper(II) Ions in Aqueous Solution Using a Dansyl–Pyrene Conjugate. V. Chandrasekhar, M. D. Pandey, S. K. Maurya, P. Sen, and D. Goswami, Chemistry – An Asian Journal 6(9), 2246–2250 (2011) [Abstract] [PDF] [BibTeX]

    Abstract: Rhythm is a dansyl: A novel dansyl–pyrene conjugate functions as a fluorescence signaling unit showing strong fluorescence quenching upon interaction with copper(II) metal ions. On the other hand, the two-photon absorption (TPA) cross-section increased from 374 to 3022 GM (at 770 nm) upon interaction with copper(II) ions, thus allowing their selective detection in aqueous solutions.

     BibTeX: @article{chandrasekharTwoPhotonAbsorptionTechniqueSelective2012,
      title = {Two-{{Photon}}-{{Absorption Technique}} for {{Selective Detection}} of {{Copper}}({{II}}) {{Ions}} in {{Aqueous Solution Using}} a {{Dansyl}}–{{Pyrene Conjugate}}},
      volume = {6},
      issn = {1861-471X},
      url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/asia.201100032},
      doi = {10.1002/asia.201100032},
      number = {9},
      journaltitle = {Chemistry – An Asian Journal},
      urldate = {2019-08-02},
      date = {2011},
      pages = {2246-2250},
      author = {Chandrasekhar, Vadapalli and Pandey, Mrituanjay D. and Maurya, Sandeep Kumar and Sen, Pratik and Goswami, Debabrata}
    }
    

26. An Efficient Nanocomposite Based on Carbon Nanotubes Functionalized with a Fluorescent Ink for Ultrafast Optical Limiting. J. Gupta, C. Vijayan, S. K. Maurya, and D. Goswami, Materials Letters 65(5), 915–917 (2011) [Abstract] [PDF] [BibTeX]

    Abstract: Functionalization of CNTs with different kinds of molecules is known to alter the optical properties of CNTs, leading to the development of new nanocomposites of interest to optoelctronics. This paper presents the design of a new and efficient optical limiting material based on carbon nanotubes (CNTs) functionalized with a commercial fluorescent ink. High resolution transmission electron microscopy (HRTEM) and optical spectroscopy indicate that the ink molecules get noncovalently attached to the surface of the CNTs. The mechanism of optical nonlinearity of the CNTs gets modified after functionalization. Z-scan studies on functionalized CNTs performed using mode-locked Ti:Sapphire femtosecond pulses at 780nm reveal the predominance of two photon absorption (TPA). Efficient and low threshold ultrafast optical limiting is demonstrated in the new nanocomposite.

     BibTeX: @article{guptaEfficientNanocompositeBased2012,
      title = {An Efficient Nanocomposite Based on Carbon Nanotubes Functionalized with a Fluorescent Ink for Ultrafast Optical Limiting},
      volume = {65},
      issn = {0167-577X},
      url = {http://www.sciencedirect.com/science/article/pii/S0167577X10010554},
      doi = {10/cd5dqh},
      number = {5},
      journaltitle = {Materials Letters},
      urldate = {2019-08-13},
      date = {2011-03-15},
      pages = {915-917},
      author = {Gupta, Jyotsana and Vijayan, C. and Maurya, Sandeep Kumar and Goswami, D.}
    }
    

27. Efficient Ultrafast Optical Limiting Using Single Walled Carbon Nanotubes Functionalized Noncovalently with Free Base and Metalloporphyrins. J. Gupta, C. Vijayan, S. K. Maurya, and D. Goswami, Journal of Applied Physics 109(11), 113101 (2011) [Abstract] [PDF] [BibTeX]

    Abstract: The present work is on the linear and third order nonlinear optical properties of single walled carbon nanotubes functionalized noncovalently with free base porphyrin and a metalloporphyrin separately. The functionalized carbon nanotubes (CNTs) are soluble in dimethylformamide, and the microscopic images show that the porphyrin molecules are attached to the surface of the CNTs. The interaction between CNTs and porphyrins is noncovalent and probably due to π-π interaction as both CNTs and porphyrins have π-electron rich structures. The samples exhibit large ultrafast nonlinear absorption as evident from the open aperture z-scan studies performed using mode-locked Ti:Sapphire femtosecond pulses at 780 nm. The mechanisms of optical nonlinearity of the functionalized CNTs appear to be two photon absorption along with nonlinear scattering with a small contribution from saturable absorption, whereas nonfunctionalized CNTs are known to exhibit saturable absorption. The value of the nonlinear absorption coefficient for the CNTs functionalized with the free base porphyrin is one order smaller than that for CNTs functionalized with metalloporphyrin. Efficient low threshold ultrafast optical limiting is demonstrated for both types of functionalized CNTs.

     BibTeX: @article{guptaEfficientUltrafastOptical2012,
      langid = {english},
      title = {Efficient Ultrafast Optical Limiting Using Single Walled Carbon Nanotubes Functionalized Noncovalently with Free Base and Metalloporphyrins},
      volume = {109},
      issn = {0021-8979, 1089-7550},
      url = {http://aip.scitation.org/doi/10.1063/1.3587178},
      doi = {10/cx5v4x},
      number = {11},
      journaltitle = {Journal of Applied Physics},
      urldate = {2019-08-13},
      date = {2011-06},
      pages = {113101},
      author = {Gupta, Jyotsana and Vijayan, C. and Maurya, Sandeep Kumar and Goswami, D.}
    }
    

28. Synthesis, Structure, and Two-Photon Absorption Studies of a Phosphorus-Based Tris Hydrazone Ligand (S)P[N(Me)N═CH-C6H3-2-OH-4-N(CH2CH3)2]3 and Its Metal Complexes. V. Chandrasekhar, R. Azhakar, B. Murugesapandian, T. Senapati, P. Bag, M. D. Pandey, S. K. Maurya, and D. Goswami, Inorg. Chem. 49(9), 4008–4016 (2010) [Abstract] [PDF] [BibTeX]

    Abstract: A phosphorus-supported multidentate ligand (S)P[N(Me)N═CH-C6H3-2-OH-4-N(CH 2CH3)2]3 (1) has been used to prepare mononuclear complexes LM [M = Fe (2) Co (3)] and trinuclear complexes L2M3 [M = Mn (4), Ni (5), Zn (6), Mg (7), Cd (8)]. In both 2 and 3 the ligand binds the metal ion in a facial coordination mode utilizing three imino nitrogen (3N) and three phenolic oxygen (3O) atoms. The molecular structures of L2Mn3, L2Ni3, L2Zn3, L2Mg3, and L2Cd3 (4−8) are similar; two trihydrazone ligands are involved in coordination to hold the three metal ions in a linear fashion. Each of the trishydrazone ligands behaves as a trianionic hexadentate ligand providing three imino and three phenolic oxygen atoms for coordination to the metal ions. The coordination environment around the two terminal metal ions is similar (3N, 3O) while the central metal ion has a 6O coordination environment. Third-order non-linear optical properties of these compounds as measured by their two-photon absorption (TPA) cross section reveals that while 1 does not possess obvious TPA activity, complexes 2 (3213 GM) and 4 (3516 GM) possess a large TPA cross section at 770 nm.

     BibTeX: @article{chandrasekharSynthesisStructureTwoPhoton2011,
      title = {Synthesis, {{Structure}}, and {{Two}}-{{Photon Absorption Studies}} of a {{Phosphorus}}-{{Based Tris Hydrazone Ligand}} ({{S}}){{P}}[{{N}}({{Me}}){{N}}═{{CH}}-{{C6H3}}-2-{{OH}}-4-{{N}}({{CH2CH3}})2]3 and {{Its Metal Complexes}}},
      volume = {49},
      issn = {0020-1669},
      url = {https://doi.org/10.1021/ic901531e},
      doi = {10/bvqgfp},
      number = {9},
      journaltitle = {Inorg. Chem.},
      urldate = {2019-08-14},
      date = {2010-05-03},
      pages = {4008-4016},
      author = {Chandrasekhar, Vadapalli and Azhakar, Ramachandran and Murugesapandian, Balasubramanian and Senapati, Tapas and Bag, Prasenjit and Pandey, Mrituanjay D. and Maurya, Sandeep Kumar and Goswami, Debabrata}
    }
    

29. Decoding Coherent Information in Femtosecond Shaped Laser Pulses. I. Bhattacharyya, A. Dutta, S. Ashtekar, S. K. Maurya, and D. Goswami, CURRENT SCIENCE 99(4), 10 (2010) [Abstract] [BibTeX]

    Abstract: We report here an experimental demonstration of a pulse decoding technique from spectral analysis of femtosecond pulses. This technique is based on a single-step Fourier domain inversion algorithm and shows the impact of the spectral window function on the retrieval of the signal pulse. Using two femtosecond laser pulses at 780 and 1560 nm from a fibre laser, we have shown that even when the spectral content of the reference pulse is far from a narrow band limit (as much as a quarter of its entire spectral content for our conditions), the single-step retrieval analysis using spectral windowing in the Fourier domain works efficiently. The enhanced signal levels possible due to the wider spectral window are critical in the unambiguous description of laser pulses, which would have potential application in the retrieval of comparatively weak and complex ultra-short pulses as is often needed in pulse shaping applications and coherent optical communications.

     BibTeX: @article{bhattacharyyaDecodingCoherentInformation2011,
      langid = {english},
      title = {Decoding Coherent Information in Femtosecond Shaped Laser Pulses},
      volume = {99},
      number = {4},
      journaltitle = {CURRENT SCIENCE},
      date = {2010},
      pages = {10},
      author = {Bhattacharyya, Indrajit and Dutta, Aveek and Ashtekar, Sumit and Maurya, Sandeep Kumar and Goswami, Debabrata}
    }