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Photonic band schemes of opals as pseudophotonic crystals composed of three-dimensional arrays of cored spheres are calculated theoretically. Pseudophotonic band gaps are confirmed to be dependent on the thickness of outer shells and also refractive indices of the inner core and outer shells. Tunabilities of photonic band schemes of these types of opals are also discussed.
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Takeda et al. (2002) studied this question.
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