Browsing by Author "Kumar, H.C.S."

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    Synthesis and third-order nonlinear optical studies of four-coordinated copper(I) complexes
    (2011) Kumar, H.C.S.; Rudresha, B.J.; Bhat, B.R.; Philip, R.; Row, T.N.G.
    Three Cu(I) halide complexes [Cu(L)(PPh3)X] (L=1,10- phenanthroline, X=Cl (1), Br (2) and I (3), PPh3=triphenylphosphine) have been synthesised and characterised by spectroscopic techniques. Further structure of the complex 1 was confirmed by single crystal X-ray diffraction analysis. The nonlinear optical properties of the complexes were investigated at 532 nm using single beam Z-scan technique with nanosecond laser pulses. The complexes showed strong optical limiting behavior due to effective three-photon absorption (3PA). The values of 3PA coefficients (?) for 1, 2 and 3 were found to be 3.2�10-24m3/W2, 6.0�10-25m3/W2 and 1.2�10 -23m3/W2 respectively, which are comparable to good optical limiting materials. These studies demonstrate that the Ligand?copper coordinative bonds facilitate the polarization of the electronic ?-system which optimizes the third-order NLO response in the reported complexes. � 2011 American Institute of Physics.
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    Synthesis and third-order nonlinear optical studies of four-coordinated copper(I) complexes
    (2011) Kumar, H.C.S.; Rudresha, B.J.; Badekai Ramachandra, B.R.; Philip, R.; Guru Row, T.N.G.
    Three Cu(I) halide complexes [Cu(L)(PPh3)X] (L=1,10- phenanthroline, X=Cl (1), Br (2) and I (3), PPh3=triphenylphosphine) have been synthesised and characterised by spectroscopic techniques. Further structure of the complex 1 was confirmed by single crystal X-ray diffraction analysis. The nonlinear optical properties of the complexes were investigated at 532 nm using single beam Z-scan technique with nanosecond laser pulses. The complexes showed strong optical limiting behavior due to effective three-photon absorption (3PA). The values of 3PA coefficients (γ) for 1, 2 and 3 were found to be 3.2×10-24m3/W2, 6.0×10-25m3/W2 and 1.2×10 -23m3/W2 respectively, which are comparable to good optical limiting materials. These studies demonstrate that the Ligand→copper coordinative bonds facilitate the polarization of the electronic π-system which optimizes the third-order NLO response in the reported complexes. © 2011 American Institute of Physics.
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    Synthesis, characterization of N, N?-bis(2-hydroxynaphthalidene) phenylene- 1,2-diamine with M(II)(M = Ni, Zn and Fe) Schiff-base complexes and their non-linear optical studies by z-scan technique
    (Elsevier B.V., 2010) Kumar, H.C.S.; Badekai Ramachandra, B.; Rudresha, B.J.; Ravindra, R.; Philip, R.
    Schiff-base complexes of N,N?-bis(2-hydroxynaphthalidene)phenylene-1, 2-diamine ligand with metal M (M = Ni(II), Zn(II) and Fe(II)) have been synthesized and characterized by their UV, FT-IR, NMR, elemental analysis and magnetic susceptibility measurements. Non-linear optical measurements carried out using nanosecond laser pulses at 532 nm show that these complexes can be used for optical limiting applications. © 2010 Elsevier B.V. All rights reserved.
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    Ultrafast optical response of a new metal organic complex-polymer composite film
    (2009) JohnKiran, A.; Lee, H.W.; Kumar, H.C.S.; Rudresha, B.J.; Bhat, B.R.; Yeom, D.-I.; Rotermund, F.
    A new Cu-based metal organic complex incorporated into poly (methyl mathacrylate) film exhibits large and fast offresonant optical nonlinearity in the 800 to 1550 nm wavelength range. A large x(3) value of l.8 x l0-10 esu is estimated. � 2009 IEEE.
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    Ultrafast optical response of a new metal organic complex-polymer composite film
    (2009) Kiran, A.J.; Lee, H.W.; Kumar, H.C.S.; Rudresha, B.J.; Bhat, B.R.; Yeom, D.-I.; Rotermund, F.
    A new Cu-based metal organic complex incorporated into poly (methyl mathacrylate) film exhibits large and fast offresonant optical nonlinearity in the 800 to 1550 nm wavelength range. A large ?(3) value of 1.8�10-10 esu is estimated. � 2009 IEEE.
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    Ultrafast optical response of a new metal organic complex-polymer composite film
    (2009) JohnKiran, A.; Lee, H.W.; Kumar, H.C.S.; Rudresha, B.J.; Badekai Ramachandra, B.R.; Yeom, D.-I.; Rotermund, F.
    A new Cu-based metal organic complex incorporated into poly (methyl mathacrylate) film exhibits large and fast offresonant optical nonlinearity in the 800 to 1550 nm wavelength range. A large x(3) value of l.8 x l0-10 esu is estimated. © 2009 IEEE.
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    Ultrafast optical response of a new metal organic complex-polymer composite film
    (2009) Kiran, A.J.; Lee, H.W.; Kumar, H.C.S.; Rudresha, B.J.; Badekai Ramachandra, B.R.; Yeom, D.-I.; Rotermund, F.
    A new Cu-based metal organic complex incorporated into poly (methyl mathacrylate) film exhibits large and fast offresonant optical nonlinearity in the 800 to 1550 nm wavelength range. A large Χ(3) value of 1.8×10-10 esu is estimated. © 2009 IEEE.