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Article Dans Une Revue Optics Letters Année : 2020

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.
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Dates et versions

hal-03100338 , version 1 (06-01-2021)

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Tomáš Halenkovič, Jan Gutwirth, Tintu Kuriakose, Marek Bouška, Mathieu Chauvet, et al.. Linear and nonlinear optical properties of co-sputtered Ge-Sb-Se amorphous thin films. Optics Letters, 2020, 45 (6), pp.1523-1526. ⟨10.1364/OL.386775⟩. ⟨hal-03100338⟩
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