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15 March 2023 The nonlinear optical response and non-equilibrium electron dynamics in Indium-Tin-Oxide (ITO)
Subhajit Sarkar, Ieng-Wai Un, Yonatan Sivan
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Proceedings Volume PC12419, Ultrafast Phenomena and Nanophotonics XXVII; (2023) https://doi.org/10.1117/12.2651666
Event: SPIE OPTO, 2023, San Francisco, California, United States
Abstract
We provide first-principles modelling of the ultrafast nonlinear optical response of low electron-density Drude materials (specifically, ITO) near their unique near-IR “epsilon-near-zero” point. We show that their 100’s-of-percent nonlinearity originates from stronger electron heating and faster cooling compared to noble metals, and unique dynamics of the chemical potential. The resulting drastic permittivity changes causes significant detunings from resonance, a rapid drop of absorptivity with increased illumination intensity and a sub-linear increase of phonon temperature with pump intensity, reaching the melting point at the experimentally-observed damage threshold. This furthers shows that the ITO nonlinearity is not electronic (“saturable”), but rather thermal.
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Subhajit Sarkar, Ieng-Wai Un, and Yonatan Sivan "The nonlinear optical response and non-equilibrium electron dynamics in Indium-Tin-Oxide (ITO)", Proc. SPIE PC12419, Ultrafast Phenomena and Nanophotonics XXVII, (15 March 2023); https://doi.org/10.1117/12.2651666
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KEYWORDS
Thermography
Ultrafast phenomena
Metals
Nonlinear optical materials
Oxides
Phonons
Plasmonics
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