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- 저자 : T.C. Sabari Girisun (검색결과 2 건)
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Synthesis, growth and characterization of bisthiourea zinc bromide for optical limiting applications
T.C. Sabari Girisun,S. Dhanuskodi,D. Mangalaraj,J. Phillip 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Bisthiourea zinc bromide (BTZB), a novel semi-organic NLO material, has been synthesized and characterized by X-ray diffraction, FT-IR absorption and electron diffraction techniques. Single crystals of BTZB with size in the range 5 × 4 × 3mm^3 have been grown from aqueous solution by slow evaporation method. Thermal analysis has been performed on the material to study its thermal stability in the temperature range 303 K―1073 K. BTZB belongs to the category soft materials as evidenced by Vicker’s microhardness tests. The material has lower dielectric constant (14.1) than its parent molecule thiourea (15.6). From optical absorption and photoluminescence spectra, the band gap has been determined to be 3.5 eV. The nonlinear optical properties have been investigated by Z-scan method and the material is found to be selfdefocusing in nature. In this paper we report the optical limiting behavior in the low-power regime for the first time in literature using a 532 nm second harmonic of a diode pumped Nd: YAG laser.
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Optical limiting behavior of certain thiourea metal complexes under CW laser excitation
S. Dhanuskodi,T.C. Sabari Girisun,S. Vinitha 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Optical nonlinearity of thiourea and its metal complexes (Zn and Cd) in water is studied in the regime of low laser power using a continuous wave diode pumped Nd:YAG laser (532 nm, 50 mW). The Z-scan technique was used to measure the nonlinearity of the medium and it is found that the predominant mechanism of nonlinearity is thermal in origin. The nonlinear refractive index and nonlinear absorption coefficient of the samples are found to be in the order of 10^-8 cm^2/W and 10^-3 cm/W respectively. The inclusion of metal has improved the optical nonlinearity of the samples than its parent molecule. The third-order nonlinear susceptibility was found to be in the order of 10^-6 esu. The self-defocusing effect observed was used to demonstrate the optical limiting action at 532 nm using the same cw laser beam.
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