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International Conference Laser Optics (ICLO)

Nonlinear metasurfaces for quantum state generation

Thomas Pertsch

Published Jun 20, 2022• 0 citations
Publisher

Abstract

We report on experimental and theoretical investi-gations of nonlinear metasurfaces from nanostructured thin films of lithium niobate, and metasurfaces hybridized with transition metal dichalcogenide monolayers. We show that the second-order nonlinear interactions in metasurfaces enable tailorable harmonic frequency generation as well as entangled photon pair sources by spontaneous parametric down-conversion.

DOI
10.1109/iclo54117.2022.9839736

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All-dielectric optical metasurfaces are a workhorse in nano-optics due to both their ability to manipulate light in different degrees of freedom and their excellent performance at light frequency conversion. Here, we demonstrate first-time generation of photon pairs via spontaneous parametric-down conversion in lithium niobate quantum optical metasurfaces with electric and magnetic Mie-like resonances at various wavelengths. By engineering the quantum optical metasurface, we tailor the photon-pair spectrum in a controlled way. Within a narrow bandwidth around the resonance, the rate of pair production is enhanced up to two orders of magnitude compared to an unpatterned film of the same thickness and material. These results enable flat-optics sources of entangled photons -- a new promising platform for quantum optics experiments.
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