When an optically birefringent nematic liquid crystal is infiltrated into the void regions of opals and inverse opals, degeneracies seen in photonic band schemes are found theoretically to disappear, resulting in the appearance of several new weak peaks in the reflection spectra. Tunabilities of the reflection peaks upon applied electric fields are discussed as a function of refractive indices and anisotropies of liquid crystals. Much larger tunabilities are demonstrated in inverse opals infiltrated with liquid crystals.
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2002
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