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本文利用多重散射方法和时域有限差分方法,理论研究了微腔旋转对二维正方晶格光子晶体耦合腔光波导群速度的影响.研究结果表明,通过旋转微腔可以造成传播模的模式分裂,从而实现群速度的降低.当微腔旋转角度为45°时,传播模的群速度最小,两个传播模的群速度分别达到了0.0016倍和0.0009倍于真空光速,与微腔未旋转时相比降低了一个数量级.上述两种传播模群速度的差别是由传播模的空间对称性决定的.
In this paper, the effect of microcavity rotation on the speed of two-dimensional square lattice photonic crystal coupled cavity optical waveguides has been studied theoretically by using multiple scattering method and finite difference time-domain method. The results show that mode propagation can be caused by rotating microcavity , So as to reduce the group velocity.When the micro-cavity rotation angle is 45 °, the group velocity of the propagation mode is the smallest, the group velocities of the two propagation modes reach 0.0016 times and 0.0009 times respectively, and when the micro-cavity is not rotated Compared with an order of magnitude lower.The difference between the velocity of the two propagation modes is determined by the spatial symmetry of the propagation modes.