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Photon acceleration and tunable broadband harmonics generation in nonlinear time-dependent metasurfaces.

ABSTRACT: Time-dependent nonlinear media, such as rapidly generated plasmas produced via laser ionization of gases, can increase the energy of individual laser photons and generate tunable high-order harmonic pulses. This phenomenon, known as photon acceleration, has traditionally required extreme-intensity laser pulses and macroscopic propagation lengths. Here, we report on a novel nonlinear material-an ultrathin semiconductor metasurface-that exhibits efficient photon acceleration at low intensities. We observe a signature nonlinear manifestation of photon acceleration: third-harmonic generation of near-infrared photons with tunable frequencies reaching up to ≈3.1ω. A simple time-dependent coupled-mode theory, found to be in good agreement with experimental results, is utilized to predict a new path towards nonlinear radiation sources that combine resonant upconversion with broadband operation.

SUBMITTER: Shcherbakov MR

PROVIDER: S-EPMC6430811 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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Photon acceleration and tunable broadband harmonics generation in nonlinear time-dependent metasurfaces.

Shcherbakov Maxim R MR Werner Kevin K Fan Zhiyuan Z Talisa Noah N Chowdhury Enam E Shvets Gennady G

Nature communications 20190322 1

Time-dependent nonlinear media, such as rapidly generated plasmas produced via laser ionization of gases, can increase the energy of individual laser photons and generate tunable high-order harmonic pulses. This phenomenon, known as photon acceleration, has traditionally required extreme-intensity laser pulses and macroscopic propagation lengths. Here, we report on a novel nonlinear material-an ultrathin semiconductor metasurface-that exhibits efficient photon acceleration at low intensities. We ...[more]

PMID: 30902994

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