With second-harmonic generation in surface and buried planar waveguides achieved by direct and reverse proton exchange in lithium niobate, we demonstrate a novel kind of quadratic spatial simulton: The transverse-electric fundamental input and the transverse-magnetic second-harmonic waves nonlinearly couple two superimposed planar waveguides, permitting transverse localization of light at room temperature and at excitations as low as 340 nJ in 20-ps pulses.
© 2003 Optical Society of America
Giuseppe Leo, Lorenzo Colace, Antonio Amoroso, Andrea Di Falco, and Gaetano Assanto, "Spatial optical simultons in nonlinearly coupled planar waveguides," Opt. Lett. 28, 1031-1033 (2003)