Optical polarization based logic functions (XOR or XNOR) with nonlinear Gallium nitride nanoslab

Details Optical polarization based logic functions (XOR or XNOR) with nonlinear Gallium nitride nanoslab Optical polarization based logic functions (XOR or XNOR) with nonlinear Gallium nitride nanoslab

2009-07-29

arxiv.org/abs/0907.5108v2

Physics

Optics

Scientific paper

We present a scheme of XOR/XNOR logic gate, based on non phase-matched noncollinear second harmonic generation from a medium of suitable crystalline symmetry, Gallium nitride. The polarization of the noncollinear generated beam is a function of the polarization of both pump beams, thus we experimentally investigated all possible polarization combinations, evidencing that only some of them are allowed and that the nonlinear interaction of optical signals behaves as a polarization based XOR. The experimental results show the peculiarity of the nonlinear optical response associated with noncollinear excitation, and are explained using the expression for the effective second order optical nonlinearity in noncollinear scheme.

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