在高频区存在巨带隙的长方晶格二维光子晶体

本文利用降低光子晶体的对称性来提高绝对禁带宽度, 提出两种长方结构长方介质柱二维光子晶体, 用快速平面波展开法研究其高频区的带结构.经参数优化发现, 长方晶格包含一套介质柱时, 最大绝对禁带宽度Δω为0.1265ωe（ωe=2πc/a, a为晶格常数, c为光速）, 绝对禁带中心频率ωmid为1.9256ωe, Δω/ωmid=6.6%; 当长方晶格包含两套介质柱时, 最大绝对禁带宽度为0.203ωe, 绝对禁带中心频率为1.8597ωe, Δω/ωmid=10.9%.

Giant Band Gaps of Rectangle Lattice 2D Photonic Crystal at High Frequency

The absolute band gap is improved by reducing the symmetry of the photonic crystal, two structures of the rectangle lattice 2D photonic crystal with rectangle dielectric rods is put forward. The modified plane-wave expansion method for calculating quickly the band structure is used to study the absolute band structure at high frequency field, parameters is optimized, when rectangle lattice 2D photonic crystal contains only one set of rectangle dielectric rods, an absolute band gap Δω=0.1265ω_e (where ω_e=2πc/a, a is the lattice constant ,c is light speed) is found at a high frequency field, which mid-frequency ω_ mid = 1.9256ω_e,Δω/ω_ mid =6.6%; when rectangle lattice 2D photonic crystal contains two set of rectangle dielectric rods, a larger absolute band gap Δω=0.203ω_e is also found at a high frequency field, which mid-frequency ω_ mid = 1.8597ω_e, Δω/ω_ mid =10.9%.