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Ultrafast sub-30-fs all-optical switching based on gallium phosphide.

ABSTRACT: Gallium phosphide (GaP) is one of the few available materials with strong optical nonlinearity and negligible losses in the visible (? > 450 nm) and near-infrared regime. In this work, we demonstrate that a GaP film can generate sub-30-fs (full width at half maximum) transmission modulation of up to ~70% in the 600- to 1000-nm wavelength range. Nonlinear simulations using parameters measured by the Z-scan approach indicate that the transmission modulation arises from the optical Kerr effect and two-photon absorption. Because of the absence of linear absorption, no slower free-carrier contribution is detected. These findings place GaP as a promising ultrafast material for all-optical switching at modulation speeds of up to 20 THz.

SUBMITTER: Grinblat G

PROVIDER: S-EPMC6570513 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature

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Ultrafast sub-30-fs all-optical switching based on gallium phosphide.

Grinblat Gustavo G Nielsen Michael P MP Dichtl Paul P Li Yi Y Oulton Rupert F RF Maier Stefan A SA

Science advances 20190614 6

Gallium phosphide (GaP) is one of the few available materials with strong optical nonlinearity and negligible losses in the visible (λ > 450 nm) and near-infrared regime. In this work, we demonstrate that a GaP film can generate sub-30-fs (full width at half maximum) transmission modulation of up to ~70% in the 600- to 1000-nm wavelength range. Nonlinear simulations using parameters measured by the <i>Z</i>-scan approach indicate that the transmission modulation arises from the optical Kerr effe ...[more]

PMID: 31214652

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