کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5026414 | 1369865 | 2016 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Optical parameters of anisotropic chain-structured Tl2InGaTe4 crystals by spectroscopic ellipsometry Optical parameters of anisotropic chain-structured Tl2InGaTe4 crystals by spectroscopic ellipsometry](/preview/png/5026414.png)
Spectroscopic ellipsometry measurements were performed on Tl2InGaTe4 single crystals in the 1.2-6.2 eV range for orientations of electric field, parallel (E//c) and perpendicular (Eâ¥c) to optic axis c. Spectral dependence of optical parameters; real and imaginary components of the dielectric function, refractive index and extinction coefficient were obtained from the analyses of experimental data using an ambient-substrate optical model. The analysis of the absorption data calculated using the extinction coefficient showed the existence of indirect transitions in the crystal with an energy band gap of â¼0.72 eV for both orientations. Interband transition (critical point) energies were revealed using second-energy derivative spectra of the dielectric function. The results showed the presence of five each interband transition structures for E//c and Eâ¥c orientations.
Journal: Optik - International Journal for Light and Electron Optics - Volume 127, Issue 22, November 2016, Pages 10637-10642