Open AccessEnhanced generation of angle correlated photon-pairs in nonlinear metasurfaces
Author(s) -
Andrea Mazzanti,
Matthew Parry,
Alexander N. Poddubny,
Giuseppe Della Valle,
Dragomir N. Neshev,
Andrey A. Sukhorukov
Publication year - 2022
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/ac599e
Subject(s) - physics , photon , parametric statistics , wavelength , bandwidth (computing) , optics , nonlinear system , quantum , spontaneous parametric down conversion , nonlinear optics , solid angle , atomic physics , optoelectronics , quantum mechanics , detector , quantum entanglement , computer network , statistics , mathematics , computer science
We reveal that strongly enhanced generation of photon pairs with narrow frequency spectra and sharp angular correlations can be realised through spontaneous parametric down-conversion in metasurfaces. This is facilitated by creating meta-gratings through nano-structuring of nonlinear films of sub-wavelength thickness to support the extended bound state in the continuum resonances, associated with ultra-high Q -factors, at the biphoton wavelengths across a wide range of emission angles. Such spectral features of photons can be beneficial for various applications, including quantum imaging. Our modelling demonstrates a pronounced enhancement, compared to unpatterned films, of the total photon-pair generation rate normalized to the pump power reaching 1.75 kHz mW −1 , which is robust with respect to the angular bandwidth of the pump, supporting the feasibility of future experimental realisations.