Nonlinear photonic crystals as a source of entangled photons.
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.
Department of Physics, University of California-Santa Barbara, Santa Barbara, California 93106, USA. mdedood@physics.ucsb.edu
Michiel J A
MJ
de Dood
William T M
WT
Irvine
Dirk
D
Bouwmeester