Abstract
We experimentally demonstrate a counterpropagating twin photons source consisting of an AlGaAs multilayer waveguide. In our geometry, a pump beam impinging on top of a waveguide generates parametrically two counterpropagating, orthogonally polarized signal/idler guided modes through a type II nonlinear interaction (Fig.l). Two phase-matched processes occur simultaneously in our scheme: in the first one, the photon copropagating with the z component of the pump beam is TM polarized and the counterpropagating one is TE polarized (process +). In the second one, the vice versa occurs (process −) [1].
© 2007 IEEE
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