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Entangled photons from subwavelength nonlinear films

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Santiago-Cruz,  Tomas
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nürnberg, Erlangen, Germany;

Sultanov,  Vitaliy
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nürnberg, Erlangen, Germany;

/persons/resource/persons201034

Chekhova,  Maria V.
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nürnberg, Erlangen, Germany;

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Citation

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


Cite as: http://hdl.handle.net/21.11116/0000-0007-DC87-9
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.