Resonant coupling of near-infrared radiation to photonic band structure waveguides

Sharp resonance features are observed in the polarized reflectivity spectra of semiconductor photonic crystals fabricated by deep periodic patterning of AlGaAs surface waveguides. Both one- (1-D) and two-dimensional (2-D) lat tices are studied by angular dependent reflectivity. By comparison with the ory me show that the sharp features in reflectivity arise from resonant cou pling of the external radiation to the folded band structure of the photoni c crystal waveguides. Wavevector selective coupling to "heavy photon" state s at the edge of the photonic Brillouin zone is demonstrated for the 1-D la ttices. In the case of the 2-D lattices me observe polarization mixing of t he photonic bands. Theoretical reflectivity spectra were obtained from a nu merical solution of Maxwells equations for the patterned waveguide and were found to be in very good agreement with experiment.