Spontaneous parametric down-conversion in ultrathin samples

Maria V. Chekhova

doi:10.1117/12.3016302

20 June 2024 Spontaneous parametric down-conversion in ultrathin samples

Maria V. Chekhova

Proceedings Volume 13004, Nonlinear Optics and its Applications 2024; 130040K (2024) https://doi.org/10.1117/12.3016302
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Miniaturization of nonlinear optical elements is one of the major trends of modern photonics. In particular, in the ‘flatoptics’ geometry, the sample is ultrathin along the light propagation direction. For nonlinear optical effects in such samples, phase matching is satisfied automatically, which allows for the use of materials with giant nonlinear susceptibilities. The tiny thickness reduces the efficiency but it can be compensated for by using geometric and material resonances. Recently also spontaneous parametric down-conversion (SPDC), leading to the generation of entangled photons, has been implemented in ultrasmall sources: subwavelength layers, metasurfaces, even nanoantennas. The lifted constraint of phase matching gives to SPDC even more freedom than to classical frequency conversion effects. The reason is that SPDC, as a spontaneous effect, is stimulated by quantum vacuum fluctuations, which populate all modes uniformly. SPDC in ultrathin samples demonstrates very broad spectral and angular width, extremely high degrees of continuous-variable entanglement, tunable polarization entanglement, and orders of magnitude enhancement of photon pair production rate due to the geometric resonances of dielectric metasurfaces.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Maria V. Chekhova "Spontaneous parametric down-conversion in ultrathin samples", Proc. SPIE 13004, Nonlinear Optics and its Applications 2024, 130040K (20 June 2024); https://doi.org/10.1117/12.3016302

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