Linear and nonlinear optical properties of co-sputtered Ge-Sb-Se amorphous thin films
Résumé
Amorphous Ge-Sb-Se thin films were co-sputtered from ${{\rm GeSe}_4}$GeSe and ${{\rm Sb}_2}{{\rm Se}_3}$SbSe targets. Depending on the film composition, linear optical properties were studied by ellipsometry. The Kerr coefficient and two-photon absorption coefficient were estimated using Sheik-Bahae's formalism for co-sputtered films of ${{\rm GeSe}_4} {\text -} {\rm Sb}_2{{\rm Se}_3}$GeSe-SbSe compared to ${{\rm GeSe}_2}{\text -}{\rm Sb}_2{{\rm Se}_3}$GeSe-SbSe pseudo-binary system and ${{\rm As}_2}{{\rm Se}_3}$AsSe as reference. The Kerr coefficient was found within the range of $4.9 {\unicode {x2013}}- 21 \times {10^{ - 18}}$4.9--21×10. Quantitatively by means of a figure of merit at 1.55 µm, thin films with compositions of ${{\rm Ge}_7}{\rm Sb}_{25}{\rm Se}_{68}$GeSbSe and ${{\rm Ge}_9}{\rm Sb}_{20}{\rm Se}_{71}$GeSbSe having an estimated Kerr coefficient of about ${10.1} \times {10^{ - 18}}\;{{\rm m}^2}{{\rm W}^{ - 1}}$10.1×10mW and ${13.4} \times {10^{ - 18}}\;{{\rm m}^2}{{\rm W}^{ - 1}}$13.4×10mW should be considered for the future nonlinear optical integrated platforms. Such compositions being close to ${({{\rm GeSe}_4})_{50}}{({{\rm Sb}_2}{{\rm Se}_3})_{50}}$(GeSe)(SbSe) pseudo-binary (i.e., ${\rm Ge}_{7.5}{\rm Sb}_{25.0}{\rm Se}_{67.5}$GeSbSe) provides just the trade-off between a high Kerr coefficient and low optical losses related to two-photon absorption.
Mots clés
- Linear and nonlinear optical properties
- Antimony compounds
- Arsenic compounds
- Co-sputtered films
- Two photon absorption
- Selenium compounds
- Economic and social effects
- Pseudo-binary systems
- Linear optical properties
- Non-linear optical
- Thin films
- Two photon processes
- Amorphous thin films
- Germanium compounds
- Nonlinear optics
- Kerr electrooptical effect
- Optical films
- Photons
- Optical properties
- Integrated platform
- Linear and nonlinear optical properties
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