Wang Donglin, Yu Zhongyuan, Liu Yumin, Lu Pengfei, Han Lihong, Feng Hao, Guo Xiaotao, Ye Han
State Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), P.O. Box 72, Beijing 100876, China.
Opt Express. 2011 Sep 26;19(20):19346-53. doi: 10.1364/OE.19.019346.
This paper reports a new designed square lattice GaAs structure of two-dimensional photonic crystals with absolute band gap approach to 0.1623 (2πc/a), where a is the period of the square lattice. The optimal structure is obtained by combining the Geometry Projection Method and Finite Element Method. Both gradient information and symmetric control points are introduced to reduce the calculation cost. For benefit to the fabrication in reality, the structure is simplified by the combination of triangle and rectangular geometry. Through parameter optimization, the absolute band gap of the new structure is improved to 0.1735 (2πc/a), which is much larger than those reported before. The new PC structure is convenient and stab for fabrication, and may be found applications in the future optical devices.
本文报道了一种新设计的二维光子晶体方形晶格砷化镓结构，其绝对带隙接近0.1623(2πc/a)，其中a为方形晶格的周期。通过结合几何投影法和有限元法获得了最优结构。引入梯度信息和对称控制点以降低计算成本。为便于实际制造，通过三角形和矩形几何形状的组合简化了结构。通过参数优化，新结构的绝对带隙提高到0.1735(2πc/a)，比之前报道的要大得多。这种新的光子晶体结构便于制造且稳定，未来可能会在光学器件中得到应用。
