Abstract:

In order to quest for large band gap or complete band gap of two-dimensional photonic crystal, the band gap of the structure in two-dimensional square lattice and triangular lattice with dielectric cylinder using the plane wave method, and the band gap of the compound structure by changing the unite cell are studied. Results show that to the dielectric rod, the middle frequencies of the band gap will reduce with the increase of the radius and refractive index of the dielectric rod. The compound dielectric cylinder structure has big TM(Transverse Magnetic) band gap, and it makes TE(Transverse Electric) band gap and the formation of this make complete band gap be possible. Changing the unite cell to reduce the symmetry of the structure is a feasible method to quest for complete band gap.

Key words: photonic crystal, two-dimensional photonic crystal, plane wave method, band gap, complete band gap