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5 October 2023 Interplay between conduction and valence band electrons in nonlinear absorption of epsilon-near-zero oxides
Quynh T. Dang, Sudip J. Gurung, Aleksei Anopchenko, Ho Wai Howard Lee
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Proceedings Volume PC12648, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XXI; PC126480C (2023) https://doi.org/10.1117/12.2679134
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
We experimentally demonstrate the dominating nonlinear saturable absorption contributed by conduction band electrons in epsilon-near-zero (ENZ) transparent conducting oxide (TCO) thin film when the plasmon-polariton mode near the ENZ regime is excited (ENZ mode). Using our engineered TCO indium tin oxide (ITO) thin film that allows three-photon absorption near the ENZ regime, we study the nonlinear absorption dynamics with z-scan nonlinearity measurement technique. We observed the competing behavior between the electrons in the valance and conduction bands at a fixed pulse intensity and various angles of incident. Our results are significant for advancing efficient all-optically tunable devices.
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Quynh T. Dang, Sudip J. Gurung, Aleksei Anopchenko, and Ho Wai Howard Lee "Interplay between conduction and valence band electrons in nonlinear absorption of epsilon-near-zero oxides", Proc. SPIE PC12648, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XXI, PC126480C (5 October 2023); https://doi.org/10.1117/12.2679134
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KEYWORDS
Electrons
Absorption
Oxides
Conduction bands
Light absorption
Photonics
Laser frequency
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