Numerical calculation has been carried out for three-dimensional (3D) dielectric photonic crystals of body-centered-tetragonal (bct) lattice structure, which can be produced by utilizing the electrorheological and magnetorheological effect. The calculation shows that there is a complete band gap between the fifth band and the sixth band if the ratio of the dielectric constant of the host medium εh to the dielectric constant of the spheres εa is high enough, εh/εa>15.7. Therefore, 3D bct dielectric photonic crystals will be suitable for various optical applications.
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Tao et al. (2002) studied this question.
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