Detailed analysis of transmission spectra and Bragg-reflection spectra of a two-dimensional photonic crystal with a lattice constant of 1.15 mu m

We investigated the transmission spectra and the Bragg-reflection spectra o f a two-dimensional photonic crystal composed of a triangular array of circ ular air rods formed in PbO glass, for which the laser oscillation peculiar to the two-dimensional photonic band structure was observed recently. The sample parameters, i.e., the lattice constant, the radius of the air rods, and the dielectric constant of the host PbO glass, were evaluated from the observation angle of the Bragg reflection and by comparison of observed wit h calculated band gaps. The transmission spectra and the Bragg-reflection s pectra were calculated with the plane-wave expansion method, and a good agr eement with both the dispersion relation and the observed Bragg-reflection spectra was shown. (C) 1999 Optical Society of America [S0740-3224(99)01003 -6]. OCIS codes: 220.4000, 260.2110, 050.1950, 120.5700, 000.4430, 050.2770 .