Entangled photon-pair generation by the metasurface. (IMAGE)

SPIE--International Society for Optics and Photonics

Entangled photon-pair generation by the metasurface.

Caption

Entangled photon-pair generation by the metasurface. (a) Because the metasurface lacks 90o rotation symmetry and the two BICs have opposite dispersion, the transverse phase matching is a hyperbolic paraboloid. (b) The angular distribution of the photon pairs is determined by the transverse phase matching condition, shown as a white dotted line. (c) The polarization entanglement can be tuned from none (Schmidt number of 1) to full (Schmidt number of 2) by varying the pump polarization.

Credit

Parry et al., doi 10.1117/1.AP.3.5.055001.

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