Second-harmonic generation in the Čerenkov configuration is investigated under conditions for which the use of a linear grating fabricated on top of the waveguide reproduces a photonic bandgap structure. The fundamental mode of the guide at the fundamental frequency is tuned at the photonic band-edge resonance, thus producing great confinement and enhancement of the electromagnetic field inside the structure. The conversion efficiency achieved in both the forward and the backward directions is at least 1 order of magnitude greater than that of a conventional Cerenkov emission in a waveguide of the same length. An analysis of the tolerances of the grating period on the conversion efficiency is presented.
© 2002 Optical Society of America
D. Pezzetta, C. Sibilia, M. Bertolotti, R. Ramponi, R. Osellame, M. Marangoni, J. W. Haus, M. Scalora, M. J. Bloemer, and C. M. Bowden, "Enhanced Čerenkov second-harmonic generation in a planar nonlinear waveguide that reproduces a one-dimensional photonic bandgap structure," J. Opt. Soc. Am. B 19, 2102-2110 (2002)