Band Gap Optimization Design of Photonic Crystals Material

[摘要] The photonic crystal has a fundamental characteristic - photonic band gap, which can prevent light to spread in the crystals. This paper studies the width variation of band gaps of two-dimension square lattice photonic crystals by changing the geometrical shape of the unit cells' inner medium column. Using the finite element method, we conduct numerical experiments on MATLAB 2012a and COMSOL 3.5. By shortening the radius in vertical axis and rotating the medium column, we design a new unit cell, with a 0.3∗3.85e-7 vertical radius and a 15 degree deviation to the horizontal axis. The new cell has a gap 1.51 percent wider than the circle medium structure in TE gap and creates a 0.0124 wide TM gap. Besides, the experiment shows the first TM gap is partially overlapped by the second TE gap in gap pictures. This is helpful to format the absolute photonic band gaps and provides favorable theoretical basis for designing photonic communication material.

[发布机构] School of Science, Beijing University of Posts and Telecommunications, Beijing; 100876, China^1;School of Management Science and Engineering, Dongbei University of Finance and Econimics, Dalian; 116025, China^2

[效力级别] 机械制造 [学科分类] 材料科学（综合）

[关键词] Communication materials;Fundamental characteristics;Geometrical shapes;Horizontal axis;Numerical experiments;Optimization design;Square lattices;Vertical axis