Entangled photons from subwavelength nonlinear films

Santiago-Cruz T, Sultanov V, Zhang H, Krivitsky LA, Chekhova M (2021)


Publication Type: Journal article

Publication year: 2021

Journal

Book Volume: 46

Pages Range: 653-656

Journal Issue: 3

DOI: 10.1364/OL.411176

Abstract

Miniaturized entangled photon sources, in particular based on subwavelength metasurfaces, are highly demanded for the development of integrated quantum photonics. Here, as a first step towards the development of quantum optical metasurfaces (QOMs), we demonstrate generation of entangled photons via spontaneous parametric down-conversion (SPDC) from subwavelength films. We achieve photon pair generation with a high coincidence-to-accidental ratio in lithium niobate and gallium phosphide nanofilms. By implementing the fiber spectroscopy of SPDC in nanofilms, we measure a spectrum with a bandwidth of 500 nm, limited only by the overall detection efficiency. The spectrum reveals vacuum field enhancement due to a Fabry-Perot resonance inside the nonlinear films. It also suggests a strategy for observing SPDC from QOM. Our experiments lay the groundwork for future development of flat SPDC sources, including QOM. (C) 2021 Optical Society of America

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How to cite

APA:

Santiago-Cruz, T., Sultanov, V., Zhang, H., Krivitsky, L.A., & Chekhova, M. (2021). Entangled photons from subwavelength nonlinear films. Optics Letters, 46(3), 653-656. https://doi.org/10.1364/OL.411176

MLA:

Santiago-Cruz, Tomas, et al. "Entangled photons from subwavelength nonlinear films." Optics Letters 46.3 (2021): 653-656.

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