Browsing by Author "Shen, L. F."

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Photonic band gaps of polygonal and circular dielectric rods in square lattices
(2008-12-01)
Chang, K. P.
;
Yang, S. L.
;
Shen, L. F.
;
Yang, T. J.
;
電子物理學系
The plane-wave method is employed to determine the band structures and the field patterns of the photonic crystals with polygonal and circular rods in square lattices. Isotropic and anisotropic N-fold polygonal rods are used to assess the effects of the shapes and symmetries of polygonal rods on E-and H-polarization modes. The photonic band structures of the polygonal rods approach those of the circular rods as N increases above a value that is determined by the optical properties of the photonic crystal. Moreover, for comparable geometric structures, anisotropic polygonal-rod photonic crystals can provide larger absolute photonic band gaps than isotropic photonic crystals. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3039213]