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Optical properties in the infrared range of the birefringent α-GeO2 single crystal

Abstract : The components of the frequency-dependent complex refractive index were determined indirectly for the new non-centrosymmetric α-GeO2 crystal using polarized Fourier transform infrared reflectivity spectra measured in the far- and mid-infrared spectral region at room temperature. All the longitudinal- and transverse-optical infrared active modes with E and A2 symmetry, according to the D3 point group, were identified and localized within the 100-1000 cm-1 range in very good agreement with a previous first-principles based calculation. For the A2- and E-type modes, both the longitudinal- and transverse-optical splitting were detected. The refractive indices no ( E⊥c) and ne (E //c) in the infrared domain present considerably higher values than the ones observed in the visible light range, and the high birefringence would find application in many optical devices.
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Submitted on : Monday, November 9, 2020 - 10:13:18 AM
Last modification on : Friday, August 5, 2022 - 10:59:03 AM
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Pascale Armand, Patrick Hermet, Jean-Louis Bantignies, Abel Haidoux, David Maurin, et al.. Optical properties in the infrared range of the birefringent α-GeO2 single crystal. Materials Research Bulletin, Elsevier, 2020, 129, pp.110881. ⟨10.1016/j.materresbull.2020.110881⟩. ⟨hal-02562585⟩



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