2维光子晶体谐振腔的分析与模拟

Analysis and simulation of two dimensional photonic crystal cavity

为指导光子晶体谐振腔的设计,运用3维电磁场仿真软件HFSS模拟了2维光子晶体谐振腔,分析了影响2维光子晶体谐振腔的主要特性参数,主要包括所插介质杆的排列结构、介电常数及其半径和间距。研究表明,在其它条件保持不变时,若增大介质杆半径,则同一模式频率没有同一的变化规律;若增大介质杆介电常数,则出现的规则模式减少,并且没有基模出现,同一个模式,频率明显降低;若增大介质杆间距,则计算的频率间隔减小,对其它参数影响不大,只是同一模式的频率略有减小。

The two dimensional photonic crystal cavities are simulated using Ansoft HFSS. Some significant parameters and factors that affect the characteristics of photonic crystal cavity, including the spatial structure of the inserted rods, the permittivity of dielectric rods, the radii and distance of rods etc, are analyzed. At the same time, the general discipline is summarized. The results show that when the radii of the dielectric rods increase, the frequency of the same mode will increase, and in the high order mode, it has a minimal value when the rod radius is 0.4 mm. When the permittivities of dielectric rods increase, the number of regular modes decrease. Further more, there is no fundamental mode which is important for using high order mode only. Considering only the change of the distance between the rods, the intervals of the frequencies decrease and the frequency of the same mode becomes a little lower. The structures of the rods also have important effect on the cavity.