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利用时域有限差分方法,理论研究了由介电常数为8.9的介质柱排列在空气背景中组成的二维正方晶格光子晶体耦合腔光波导的传输特性。理论模拟结果表明,将微腔紧邻的两个圆形介质柱改变为椭圆形,通过改变椭圆的旋转角度能够调控导模的频率范围。通过将相邻微腔两边的椭圆形设置为不同旋转角度,可以在保证高传输效率的同时进一步地降低导模的群速度。基于上述结构的光子晶体分支波导,可以实现对不同频率信息的共享和选择。
Using the finite difference time domain method, the propagation characteristics of a two-dimensional square lattice photonic crystal coupled cavity optical waveguide composed of a medium column with a dielectric constant of 8.9 arranged in an air background are theoretically studied. Theoretical simulation results show that the two circular dielectric columns with micro-cavities are changed to oval shapes, and the frequency range of the guided modes can be controlled by changing the rotation angle of ellipses. By setting the ellipses on two sides of adjacent microcavities to different rotation angles, the group velocity of the guided mode can be further reduced while ensuring the high transmission efficiency. Based on the photonic crystal branch waveguide with the above structure, the sharing and selection of different frequency information can be realized.