%0 Journal Article
%T Optical properties in the infrared range of the birefringent α-GeO2 single crystal
%+ Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM)
%+ Laboratoire Charles Coulomb (L2C)
%+ Cristaux massifs (NEEL - CrisMass)
%+ Optique et Matériaux (NEEL - OPTIMA)
%A Armand, Pascale
%A Hermet, Patrick
%A Bantignies, Jean-Louis
%A Haidoux, Abel
%A Maurin, David
%A Ménart, Bertrand
%A Peña, Alexandra
%A Papet, Philippe
%< avec comité de lecture
%@ 0025-5408
%J Materials Research Bulletin
%I Elsevier
%V 129
%P 110881
%8 2020
%D 2020
%R 10.1016/j.materresbull.2020.110881
%K oxides
%K optical properties
%K infrared spectroscopy
%Z Chemical Sciences/Material chemistry
%Z Chemical Sciences/Inorganic chemistryJournal articles
%X 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.
%G English
%2 https://cnrs.hal.science/hal-02562585/document
%2 https://cnrs.hal.science/hal-02562585/file/IR-reflectivity-GeO2.MRB.pdf
%L hal-02562585
%U https://cnrs.hal.science/hal-02562585
%~ UGA
%~ CNRS
%~ ENSC-MONTPELLIER
%~ INPG
%~ NEEL
%~ ICG
%~ L2C
%~ INC-CNRS
%~ NEEL-OPTIMA
%~ NEEL-CRISMASS
%~ MIPS
%~ CHIMIE
%~ UNIV-MONTPELLIER
%~ TEST-HALCNRS
%~ UGA-EPE
%~ UM-2015-2021
%~ NEEL-TECHNO