Abstract
Optical transmission measurement on two similar two-dimensional (2D) triangular lattices of air rods with different lattice constants of the order of 1.0 \ensuremath{\mu}m has revealed that the central frequencies of photonic band gaps show a reasonable shift relative to each other. The respective gap frequencies observed in the 1.02-\ensuremath{\mu}m lattice are found to be consistent with the theoretical ones. These two facts provide firm evidence for the existence of a common gap for H polarization in the entire 2D Brillouin zone. \textcopyright{} 1996 The American Physical Society.
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