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Frequency Conversion in a Time-Variant Dielectric Metasurface

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journal contribution
posted on 17.09.2020, 14:05 by Nicholas Karl, Polina P. Vabishchevich, Maxim R. Shcherbakov, Sheng Liu, Michael B. Sinclair, Gennady Shvets, Igal Brener
The color of light is a fundamental property of electromagnetic radiation; as such, control of the frequency is a cornerstone of modern optics. Nonlinear materials are typically used to generate new frequencies, however the use of time-variant systems provides an alternative approach. Utilizing a metasurface that supports a high-quality factor resonance, we demonstrate that a rapidly shifting refractive index will induce frequency conversion of light that is confined in the nanoresonator meta-atoms. We experimentally observe this frequency conversion and develop a time-dependent coupled mode theory model that well describes the system. The intersection of high quality-factor resonances, active materials, and ultrafast transient spectroscopy leads to the demonstration of metasurfaces operating in a time-variant regime that enables enhanced control over light–matter interaction.