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arXiv · 2012.06604

Externally driven nonlinear time-variant metasurfaces

Varvara V. Zubyuk·Pavel A. Shafirin·Maxim R. Shcherbakov·Gennady Shvets·Andrey A. Fedyanin
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Abstract

Resonant photonic nanostructures exhibiting enhanced nonlinear responses and efficient frequency conversion are an emergent platform in nonlinear optics. High-index semiconductor metasurfaces with rapidly tuned high-Q resonances enable a novel class of time-variant metasurfaces, which expands the toolbox of color management at the nanoscale. Here, we report on the dynamic control of the nonlinear optical response in time-variant semiconductor metasurfaces supporting high-quality factor resonances in the near-infrared spectral range. Pump-probe measurements of germanium metasurfaces at negative pump-probe time delays reveals frequency conversion in the fundamental beam and a blue-shift of 10~nm (3.05$\omega$) and 40% broadening in the third harmonic signal due to the photoinduced time-variant refractive index. A time-dependent coupled-mode theory, in excellent agreement with the experimental data, validated the time-variant nature of the system. Our findings expand the scope of time-variant metasurfaces and may serve as base for the next generation of nanoscale pulse shapers, optical switches and light sources.

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Varvara V. Zubyuk, Pavel A. Shafirin, Maxim R. Shcherbakov, Gennady Shvets, Andrey A. Fedyanin. 2020-12-11. Externally driven nonlinear time-variant metasurfaces. https://arxiv.org/abs/2012.06604

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