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4 October 2023 Invertible ultrafast nonlinearity in epsilon-near-zero materials
Hayk Harutyunyan, Chentao Li, Xinyu Tian, Guoce Yang, Sukrith U. Dev, Monica Allen, Jeffery Allen
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Proceedings Volume PC12646, Metamaterials, Metadevices, and Metasystems 2023; PC126461M (2023) https://doi.org/10.1117/12.2688984
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
Epsilon-near-zero (ENZ) materials such as indium tin oxide (ITO), have recently emerged as a new platform to enhance optical nonlinearities. In this talk I will report on our recent theoretical and experimental results on the origin of ultrafast nonlinearities in ITO films that are dominated by intraband and interband transitions. We show that there are two competing factors that jointly contribute to a spectrally-invertible nonlinearity of ITO near its ENZ region i.e. the nonparabolicity of the bands that results in a larger effective mass and the Fermi energy shift, which determines the free carrier density. Our work reveals the relationship between the large nonlinearity and the intrinsic material properties of the ITO films which will enable design and development of photonic materials and nonlinear devices made of transparent conductive oxides.
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Hayk Harutyunyan, Chentao Li, Xinyu Tian, Guoce Yang, Sukrith U. Dev, Monica Allen, and Jeffery Allen "Invertible ultrafast nonlinearity in epsilon-near-zero materials", Proc. SPIE PC12646, Metamaterials, Metadevices, and Metasystems 2023, PC126461M (4 October 2023); https://doi.org/10.1117/12.2688984
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KEYWORDS
Ultrafast phenomena
Oxides
Design and modelling
Indium
Materials properties
Nonlinear optics
Spectral density
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