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Conference on Lasers and Electro-Optics

Down-conversion and entangled photon pairs

M. J. A. de Dood, William T. M. Irvine, Dirk Bouwmeester

Published May 16, 2004• 0 citations
OpenAlex

Abstract

Degenerate down-conversion in photonic crystals is investigated as a source of entangled photons. Phase matching relies on form birefringence and on a change in phase velocity near the band edge of the photonic crystal.

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Nonlinear photonic crystals can be used to provide phase matching for frequency conversion in optically isotropic materials. The phase-matching mechanism proposed here is a combination of form birefringence and phase velocity dispersion in a periodic structure. Since the phase matching relies on the geometry of the photonic crystal, it becomes possible to use highly nonlinear materials. This is illustrated considering a one-dimensional periodic Al0.4Ga0.6As/air structure for the generation of 1.5 microm light. We show that phase-matching conditions used in schemes to create entangled photon pairs can be achieved in photonic crystals.