A finite differece in time domain(FDTD) method is employed to calculate defect modes in a two-dimensional photonic crystal consisting of anisotropic cylinders of tellurium. In order to obtain a defect mode inside the complete band gap, we adjust the radius Rd of the central defect and radius Rn of the neighboring defects. It is shown that the defect modes for the E-polarization are not sensitive to Rn, while the resonance frequency for H-polarization varies regularly as Rn changes. When the filling fraction f = 0.4 (R = 0.3568a), Rd = 0.55a and Rn = 0.26a, the defect mode has the same resonance frequency ω0 = 0.2466ωe (where ωe = 2πc/a, a, c being lattice constants) for both E- and H-polarization.
|Journal||Wuli Xuebao/Acta Physica Sinica|
|Number of pages||2|
|Publication status||Published - Sep 2002|
- Defect mode
- Photonic crystal