The band structures of metallic photonic crystals filled with different mediums

Abstract

提出了一种利用全反射抑制二维光子晶体表面电磁波泄漏的方法，并计算了不同背景介质下的二维金属Cu光子晶体的带隙结构，得到了带隙结构与填充率间的关系曲线。计算方法采用时域有限差分，金属型光子晶体由Cu柱构成。分别计算了以空气为背景介质和以PMMA为背景介质的正方晶格金属型光子晶体的带隙结构。研究结果表明：以PMMA为背景介质的正方晶格金属型光子晶体与以空气为背景介质相比，第一带隙更窄，第二带隙中心频率更低，且在填充率大于0.70时将会出现第三带隙。这对进一步扩展这种光子晶体的应用具有良好的参考意义。;A method is proposed to inhibit the leakage of electromagnetic waves on the surface of 2D photonic crystals using total internal reflection. The band structures of 2D metallic photonic crystals with different background mediums are analyzed. The band structures as a function of the filling factor are obtained via FDTD method. The metallic photonic crystals are composed of Cu columns. Two kinds of background media, air and PMMA, were selected in this study. The band structures of these two 2D square-lattice metallic photonic crystals were analyzed separately. The results indicate that the metallic photonic crystals filled with PMMA have a narrower first band gap and a lower second band gap than the metallic photonic crystals filled with air. A third band gap appears in the metallic photonic crystals with PMMA as the background medium when the filling factor reaches 0.70. This work provides a good reference value for the application of photonic crystals.