Spatial optical simultons in nonlinearly coupled planar waveguides

G. Leo, L. Colace, A. Amoroso, A. Di Falco, and G. Assanto

Opt. Lett. 28, 1031-1033 (2003)


With second-harmonic generation in surface and buried planar waveguides achieved by direct and reverse proton exhange in lithium niobate, we demonstrate a novel kind of quadratic spatial simultons: 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.