The DFT calculations indicated that α-As 2Te 3 possess sufficient optical absorption in a wide wavelength region, including 1.5 μm, 1.9 μm, and beyond (up to 3.7 μm). The density functional theory (DFT) calculations of the electronic band structures of α-As 2Te 3 were also conducted to obtain a better understanding of their energy band structure. Furthermore, this is the first time report on β value of a group-15 sesquichalcogenide at a 1.9-μm wavelength. In particular, the β value at 1.56 μm is an order of magnitude larger than the previously reported values of other group-15 sesquichalcogenides such as Bi 2Se 3, Bi 2Te 3, and Bi 2TeSe 2. More specifically, the nonlinear optical absorption properties of the prepared α-As 2Te 3 were investigated at wavelengths of 1.56 and 1.9 μm using the open-aperture (OA) Z-scan technique. We report the first investigation results of the nonlinear optical properties of As 2Te 3.
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