Abstract

We investigated the transmission spectra and the Bragg-reflection spectra of a two-dimensional photonic crystal composed of a triangular array of circular 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 with calculated band gaps. The transmission spectra and the Bragg-reflection spectra were calculated with the plane-wave expansion method, and a good agreement with both the dispersion relation and the observed Bragg-reflection spectra was shown.

© 1999 Optical Society of America

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