Enhanced second-harmonic generation from planar photonic crystals.
Strongly enhanced second-harmonic generation is observed from a two-dimensional square lattice GaAs/AlGaAs photonic crystal waveguide when the fundamental beam, the second-harmonic beam, or both beams resonantly couple to a leaky eigenmode. P-polarized second-harmonic spectra are obtained for s-polarized, 150-fs pump pulses that are tuned from 5000 to 5600 cm(-1) and directed along the gamma-chi direction of the crystal for various angles of incidence. Compared with off-resonant conditions, enhancements of >1200x in the second-harmonic conversion are observed for resonant coupling of both the fundamental and the second-harmonic fields to leaky eigenmnodes. The angular and spectral positions of the peaks are in good agreement with simulations.
Mondia
J P
JP
Department of Physics, University of Toronto, Toronto, Canada, M5S 1A7. mondia@physics.utoronto.ca
van Driel
H M
HM
Jiang
W
W
Cowan
A R
AR
Young
Jeff F
JF