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利用一维变周期谐振腔阵列和非线性缓变边界,可以实现光波从脊波导到光子晶体平面波导(PCW)的高效耦合.基于平面波展开法(PWE)和时域有限差分法(FDTD),深入分析和讨论了普通脊波导、2D-PCW结构和本征模以及工作模式、缓变边界形状等对耦合效率的影响,从而得出光波从脊波导到2D-PCW、再返回脊波导的统一图景.指出考虑模式转换和采用缓变边界条件可以极大提高PCW与脊波导间的耦合效率.对PC-PW边界采用线性和非线性缓变结构进行了仿真,讨论了边界缓变程度对耦合效率的影响.结果表明,采用模式耦合和PC-PW余弦缓变边界时的耦合效率在较宽的带宽内超过了95%.
The efficient coupling of light waves from ridge waveguide to photonic crystal planar waveguide (PCW) can be achieved by using a one-dimensional variable-period resonator array and a non-linear slow-moving boundary.Based on the PWE and FDTD, In-depth analysis and discussion of the common ridge waveguide, 2D-PCW structure and the intrinsic mode and mode of operation, the slow boundary shape changes on the coupling efficiency, resulting in the light wave from the ridge waveguide to 2D-PCW, and then return to the unity of the ridge waveguide It is pointed out that the coupling efficiency between the PCW and the ridge waveguide can be greatly improved by considering the mode transition and using the slowly changing boundary conditions.The linear and nonlinear creep structure of the PC-PW boundary is simulated, Efficiency.The results show that the coupling efficiency with mode-coupled and PC-PW cosine creep boundaries exceeds 95% over a wide bandwidth.