title: Optical polarization based logic functions (XOR or XNOR) with nonlinear Gallium nitride nanoslab.
abstract: 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.
authors.affiliation: Quantum Optics Lab., Elsag-Datamat Via Puccini 2 Genova, Italy.
authors.forename: F A
authors.initials: FA
authors.lastname: Bovino
authors.forename: M C
authors.initials: MC
authors.lastname: Larciprete
authors.forename: M
authors.initials: M
authors.lastname: Giardina
authors.forename: A
authors.initials: A
authors.lastname: Belardini
authors.forename: M
authors.initials: M
authors.lastname: Centini
authors.forename: C
authors.initials: C
authors.lastname: Sibilia
authors.forename: M
authors.initials: M
authors.lastname: Bertolotti
authors.forename: A
authors.initials: A
authors.lastname: Passaseo
authors.forename: V
authors.initials: V
authors.lastname: Tasco
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005708:Gallium / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000295:instrumentation*; D017711:Nonlinear Dynamics; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*
chemical_list: C473348:gallium nitride; D005708:Gallium