The waveguiding properties of nonlinear hybrid waves guided by integrated-optics structures containing both birefringent crystals and isotropic nonlinear media have been investigated. The existence of both TE- and TM-dominant stationary hybrid waves guided by an ultrathin-film configuration has been pointed out, and a thresholding behavior, with a tunable minimum power through the crystal optical-axis orientation, has been found.
Juan P. Torres, Torner, L., Lederer, F., Mihalache, D., Baboiu , D., Ciumac, M. Nonlinear hybrid guided waves in birefringent media. "Journal of the Optical Society of America B. Optical physics", Juny 1994, vol. 11, núm. 6, p. 983-985.