Abstract: Porous synthetic opal possessing a three-dimensional photonic band structure of semimetallic type was impregnated with polycrystalline {CdS}. The photonic stop band in (111) direction was examined by means of photoreflection technique. Under cw laser excitation of semiconductor inclusions the reflectance of the system changes indicating a modification of photonic band structure. A possible mechanism is discussed. Numerical simulations within the framework of quasicrystalline approximation are given.

Keywords: colloidal crystals; gap; spectroscopy; opals

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