Articles written in Bulletin of Materials Science

    • Linear and non-linear optical properties of amorphous Se and M5Se95 (M $=$ Ge, Ga and Zn) films


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      The variations in structure and optical properties of amorphous a-Se and a-M$_5$Se$_{95}$ (M = Ge, Ga and Zn) films have been studied based on FTIR and optical measurements. FTIR transmittance spectra for a-Se and a-M$_5$Se$_{95}$ (M $=$ Ge, Ga and Zn) glasses were measured as a function of wavenumber. The addition of Ge, Ga and Zn increases the vibrational frequency of the a-Se main band. The absorption edge of Ge$_5$Se$_{95}$ shifted towards long side of the wavelength in comparison with that of a-Se film. This shift increases gradually in the case of Ga$_5$Se$_{95}$ and Zn$_5$Se$_95$ films. So, the optical bandgap ofM5Se95 films was decreased, but the index of refraction was increased. The first and third order of electric susceptibility ($\chi_{(1)}$ and $\chi_{(3)}$) and non-linear index of refraction ($n_2$) were increased by adding Ge, Ga and Zn into a-Se.

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