期刊
ACS PHOTONICS
卷 9, 期 2, 页码 493-502出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.1c01222
关键词
metasurfaces; nonlinear optics; time-variant materials; ultrafast processes; high-Q resonances; all-optical modulation
类别
资金
- Russian Science Foundation [1812-00475]
- Ministry of Science and Higher Education of Russian Federation [W03.31.0008]
- MSU Quantum Technology Centre
- National Science Foundation [NNCI-2025233]
This study reports the dynamic control of the nonlinear optical response in time-variant semiconductor metasurfaces supporting high-Q resonances in the near-infrared spectral range, and validates the time-variant nature of the system.
Resonant photonic nanostructures exhibiting enhanced nonlinear response and efficient frequency conversion are an emergent platform in nonlinear optics. High-index semiconductor metasurfaces with rapidly tuned high-quality-factor (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-Q resonances in the near-infrared spectral range. Germanium metasurfaces reveal frequency conversion of the fundamental beam and blue-shift of 10 nm (3.05 omega) and 40% broadening in the third-harmonic spectrum due to a subpicosecond-scale time-variant refractive index. A time-dependent coupled-mode theory, in qualitative 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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