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Conference on Lasers and Electro-Optics

Photon-pair Generation Via Multiple Bound States in the Continuum in Nonlinear Metasurfaces

Matthew Parry, Andrea Mazzanti, Alexander N. Poddubny, Giuseppe Della Valle, Dragomir N. Neshev, Andrey A. Sukhorukov

Published Jan 1, 2021• 0 citations
Publisher

Abstract

We present a nonlinear metasurface with engineered symmetry facilitating an orders-of-magnitude enhancement of photon-pair generation and tunable entanglement through hyperbolic phase matching of spontaneous parametric down-conversion via multiple extended bound states in the continuum.
DOI
10.1364/cleo_qels.2021.fth2j.7

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We present theoretical and experimental advances on photon-pair generation through spontaneous parametric down-conversion (SPDC) in nonlinear nanostructures and metasurfaces, underpinning quantum entanglement engineering at sub-wavelength scale for photon shaping with tailored polarization and spatial correlations. We derive explicit theoretical expressions for the measurable photon counts and quantum correlations, incorporating material dispersion and absorption characteristics [Phys. Rev. Lett. 117, 123901 (2016)], and demonstrate experimentally the generation of quantum heralded photon pairs from a single AlGaAs nanodisk [Optica 6, 1416 (2019)]. We further reveal the opportunities to enhance the generation rate through high-Q resonances including bound states in the continuum [doi:10.1117/12.2539888 (2019)]. We also outline the applications of metasurfaces for the manipulation and measurement of multi-photon quantum states for free-space quantum imaging and communications.
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