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Linear and nonlinear optical properties of co-sputtered Ge-Sb-Se amorphous thin films

Abstract : Amorphous thin films co-sputtered from GeSe4 and Sb2Se3 targets were investigated for potential applications in the field of nonlinear optics. Depending on the sputtered film composition, linear optical properties were studied by ellipsometry. Kerr coefficient and two-photon absorption coefficient were estimated using Sheik-Bahae's formalism for co-sputtered films of GeSe4-Sb2Se3 compared to GeSe2-Sb2Se3 pseudo-binary system and As2Se3 as reference. Kerr coefficient was found within the range of 4.9-21×10-18 m 2 W-1. Quantitatively by means of figure of merit at 1.55 μm, thin films with compositions of Ge7Sb25Se68 and Ge9Sb20Se71 having estimated Kerr coefficient of about 10.1×10-18 m 2 W-1 and 13.4×10-18 m 2 W-1 should be considered for the future nonlinear optical integrated platforms. Such compositions being close to (GeSe4)50(Sb2Se3)50 pseudo-binary (i.e. Ge7.5Sb25.0Se67.5) provides just the trade-off between high Kerr coefficient and low optical losses related to two-photon absorption.
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Submitted on : Wednesday, January 6, 2021 - 3:42:23 PM
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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, Optical Society of America - OSA Publishing, 2020, 45 (6), pp.1523. ⟨10.1364/OL.386775⟩. ⟨hal-03100338⟩



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