TY - JOUR
T1 - Enhanced generation of angle correlated photon-pairs in nonlinear metasurfaces
AU - Mazzanti, Andrea
AU - Parry, Matthew
AU - Poddubny, Alexander N.
AU - Della Valle, Giuseppe
AU - Neshev, Dragomir N.
AU - Sukhorukov, Andrey A.
N1 - Publisher Copyright:
© 2022 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.
PY - 2022/3/1
Y1 - 2022/3/1
N2 - 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.
AB - 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.
KW - bound state in the continuum
KW - entangled photons
KW - nonlinear metasurface
KW - quantum correlations
KW - spontaneous parametric downconversion
UR - http://www.scopus.com/inward/record.url?scp=85128113836&partnerID=8YFLogxK
U2 - 10.1088/1367-2630/ac599e
DO - 10.1088/1367-2630/ac599e
M3 - Article
VL - 24
JO - New Journal of Physics
JF - New Journal of Physics
IS - 3
M1 - 035006
ER -