Abstract
Transmission spectra of synthetic opal photonic crystals have been measured in the wavelength range of their band gap. The results indicate that the minimum-transmission wavelength depends on the lattice constant of opal and, hence, on the position of the photonic band gap. For synthetic opal samples on the order of 1 mm in thickness, the experimentally determined transmittance in the wavelength range of the photonic band gap does not exceed a fraction of a percent.
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