Indium Sulphide (InS) single crystals are successfully grown by In flux. Single crystal X-ray diffraction shows orthorhombic structure of Pnnm space group. Ellipsometry measurements performed on the (010) oriented crystal exhibit low anisotropy in the 300-1000 nm wavelength range and consequently negligible THz emission is observed. Optical band gap of 2.09eV is deduced from linear optical measurements. Nonlinear optical properties are studied by single beam Z-scan measurements at 800 nm, where two-photon absorption is present. Nonlinear refractive index and absorption coefficient are estimated to be η2 = 2.310−11cm2/W and β= 62.4cm/GW, respectively for excitation intensity of 0.32GW/cm2. The origin of nonlinearity in InS crystal is accounted to be due to the third-order anharmonic motion of the bound electrons.
@article{arxiv.1309.7485,
title = {Physical, optical and nonlinear properties of InS single crystal},
author = {Pallavi Kushwaha and Anuradha Patra and E. Anjali and Harshad Surdi and C. Gurada and S. Ramakrishnan and S. S. Prabhu and Venu Gopal Achanta and A. Thamizhavel},
journal= {arXiv preprint arXiv:1309.7485},
year = {2015}
}