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Browsing by Author "Lin, Wen Hao"

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    The optical properties of Ag2Te crystals from THz to UV
    (2017-11-25)
    Yeh, Tien-Tien
    ;
    Lin, Wen Hao
    ;
    Tzeng, Wen-Yen
    ;
    Le, Phuoc Huu
    ;
    Luo, Chih-Wei
    The optical properties of monoclinic Ag2Te crystals are studied in a wide range (3.7 meV-6.2 eV) of photon energies. The measured reflectivity spectra from THz to UV allow unambiguous a photon energy-dependent complex dielectric function, complex refractive index and absorption coefficient to be obtained. The spectral structure in these optical parameters further indicates the coexistence of an indirect transition with a bandgap energy of about 10 meV and a direct transition with a bandgap energy of about 1.84 eV. (C) 2017 Elsevier B. V. All rights reserved.