Generation of broadband frequency-entangled photons using plasmon nanoantenna

Abstract

A scheme for the generation of frequency-entangled photons using a plasmon nanoantenna system is proposed. The nanoantenna system consists of two large metallic nanostructures confined in a one-sided microcavity with high spontaneous emission factor. Two input photons are converted into an entangled photon pair via the saturation effect of the nanoantenna. The degree of entanglement of the resultant entangled photons is evaluated using the entropy of entanglement, E. We show that broadband frequency-entangled photons with E up to ≈0.45 are generated owing to rapid plasmon radiative decay. © 2013 AIP Publishing LLC.