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Laser beam deflection sensor in a planar optical waveguide based in the Mirage effect

The beam deflection of a guided mode in a planar optical waveguide is analyzed. The deflexion is caused by a gradual change in the depth of the waveguide that is transversal to its propagation direction. The beam deflection angle could be modulated by a change in the refractive index at the surface layer of the waveguide. We present numerical results to evaluate the deflexion in the case of a glass integrated structure.