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1 August 2021 Efficient epsilon-near-zero metasurface for time-varying applications and time diffraction
Romain Tirole, Taran Attavar, Jakub Dranczewski, Emanuele Galiffi, John Pendry, Stefan Maier, Stefano Vezzoli, Riccardo Sapienza
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Proceedings Volume 11795, Metamaterials, Metadevices, and Metasystems 2021; 117951E (2021) https://doi.org/10.1117/12.2593924
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
Time-varying metasurfaces have recently emerged as a new topic of interest for control of light at the nanoscale and exploration of fundamental physics. We demonstrate time diffraction from a time slit in an unstructured metasurface. In a pump-probe experiment, excitation of the Berreman mode of a thin film of Indium-Tin-Oxide over gold leads to strong, efficient all-optical modulation of the film, and to time diffraction of the probe. In comparison to previous works in unstructured epsilon-near-zero films, we obtain a 6 nm frequency shift and a 23 nm broadening using lower intensities and a significantly lower thickness of 40 nm, which demonstrates the minimal footprint of the structure. The deeply subwavelength nature of the sample makes a time-varying interpretation simple and efficient, paving the way for time-dependent architectures for ultrafast optical experiments.
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Romain Tirole, Taran Attavar, Jakub Dranczewski, Emanuele Galiffi, John Pendry, Stefan Maier, Stefano Vezzoli, and Riccardo Sapienza "Efficient epsilon-near-zero metasurface for time-varying applications and time diffraction", Proc. SPIE 11795, Metamaterials, Metadevices, and Metasystems 2021, 117951E (1 August 2021); https://doi.org/10.1117/12.2593924
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KEYWORDS
Diffraction
Modulation
Absorption
Gold
Thin films
Ultrafast phenomena
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