Subhasis Das

University of Burdwan, Burdwān, Bengal, India

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Publications (3)6.19 Total impact

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    ABSTRACT: An organic nonlinear optical single crystal of ninhydrin was grown by Sankaranarayanan–Ramasamy (SR) method by using specially designed glass ampoule. The good quality seed crystal has been prepared by conventional solution growth technique using double distilled water as the solvent. The lattice dimension of the grown specimen was identified from the powder X-ray diffraction analysis and found that it crystallized in a monoclinic system with non-centrosymmetric space group P21. The presence of functional groups was examined by Fourier transform infrared (FTIR) analysis and it was found that there was no incorporation of foreign elements during crystallization. The surface defects were assessed by optical microscope and the dielectric constant and dielectric loss were carried out by LCR meter. Laser damaged threshold, relative second harmonic generation (SHG) and phase matching were measured by using a high intensity Nd:YAG laser as a source having the wavelength of 1064 nm. Its thermal stability has been assessed by TG–DTA and specific heat measurements with respect to different temperatures. The optical studies show that the crystal has transmittance ability of light in the entire visible region.
    CrystEngComm 01/2013; · 3.88 Impact Factor
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    ABSTRACT: In the present communication, we have successfully synthesized the efficient NLO material of glycine hydrofluoride (GHF) by conventional chemical reaction, and grown the single crystal by adopting slow evaporation solution growth technique. In order to know its suitability for device fabrication, different characterization analyses have been performed. The lattice constants have been determined from powder X-ray diffraction (PXRD) method and found that it crystallizes in orthorhombic crystal system. Its crystalline perfection was evaluated by high-resolution X-ray diffraction technique (HRXRD) and the value of FWHM indicates the presence of low angle structural grain boundaries. Its luminescence behaviour has been analysed by photoluminescence (PL) analysis and found maximum luminescence in the lower wavelength region. Its relative second harmonic generation efficiency was evaluated from Kurtz powder technique. The phase matching angle of GHF was determined by using Nd:YAG laser as a source. Its thermal, mechanical and electrical properties were examined by TG/DTA, Vickers microhardness tester and dielectric measurements, respectively.
    Journal of Materials Science 07/2009; 44(13):3457-3461. · 2.31 Impact Factor
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    ABSTRACT: Good quality single crystals of benzimidazole (BMZ) (4 × 5 × 6 mm3) have been successfully grown by solvent evaporation method using methanol as the solvent. The grown crystal belongs to orthorhombic system and the lattice constants were found from the powder X-ray diffraction analysis. The refractive index was determined at two different wavelengths by Brewster's angle method and found to be 1.607 and 1.613 respectively. The dielectric constant and dielectric loss of the crystal was studied as a function of frequency with different temperatures and the results are discussed. The optical band gap has been determined from the UV–Vis., analysis, and found that 4.1 eV. Such a wide band gap materials are useful for photonic and optoelectronic applications. The luminescence behavior has been examined in the wavelength region between 500–800 nm by using Ar+ ion laser as a source. The relative second harmonic generation (SHG) efficiency of the grown specimen is 4.5 times greater than that of the potassium dihydrogen phosphate (KDP) single crystal. Its phase matching angle has also been determined.
    Materials Letters. 03/2008; 62(s 8–9):1252–1254.