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17 September 2018 Time-dependent nonlinear metasurfaces (Conference Presentation)
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In this talk I will describe a new concept/application of high-Q semiconductor metasurfaces:P spectral shifting of the incident radiation through the phenomenon of photon acceleration. Semiconductor metasurfaces represent a unique platform for linear and nonlinear optics. Because semiconductors typically have a high refractive index, the resulting meta-molecules can support a wide selection of sharp Mie resonances that can be used for shaping their optical response to incident light. Mid-IR photonic has additional benefit: the optical response can be tuned through optical injection of free carriers because of the lambda^2 scaling of the refractive index change. I will describe how ultra-intense femtosecond laser pulses rapidly create free carriers in a spectrally-selective metasurface, thereby blue-shifting its resonant frequency during the lifetime of a trapped mid-IR photon. As the result, the photon is “accelerated”, and can contribute to spectrally blue-shifted and broadened harmonics generation. To our knowledge, this is the first experimental demonstration of a metasurface that is simultaneously time-dependent and nonlinear. The fundamental importance of photon acceleration is that it overcomes what was considered a key limitation of the resonant efficiency enhancement of nonlinear processes using spectrally-selective metasurfaces: that it must come at the expense of the bandwidth. Our results demonstrate that both the efficiency and the bandwidth can be simultaneously enhanced.
Conference Presentation
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Gennady B. Shvets "Time-dependent nonlinear metasurfaces (Conference Presentation)", Proc. SPIE 10721, Active Photonic Platforms X, 1072102 (17 September 2018);

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