Modified tapered interface for efficient coupling between inner and surface photonic crystal waveguides
Modified tapered interface for efficient coupling between inner and surface photonic crystal waveguides
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DOI：
10.1117/1.oe.53.2.027104
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发表时间：
2014-02
影响因子：
1.3
通讯作者：
S. Li;Tianbao Yu;N. Liu;Tongbiao Wang;Xu-ming Xu-Xu-ming-Xu-12186699;Q. Liao
中科院分区：
文献类型：
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作者：
S. Li;Tianbao Yu;N. Liu;Tongbiao Wang;Xu-ming Xu-Xu-ming-Xu-12186699;Q. Liao
抽象。光子晶体内波导的有效耦合是光子晶体在光子集成电路中应用的关键。本文讨论了基于全光子晶体结构的表面光子晶体波导与内光子晶体波导的高效耦合。引入修正锥的目的是逐渐压缩在表面传播的扩展场，并在修正斜面处激发表面模式。通过保持波导结构不变，实现了界面两侧模场分布的良好匹配。基于时域有限差分模拟的数值结果表明，耦合效率>90%的带宽可以宽至约80 nm。
Abstract. Efficient coupling into inner photonic crystal waveguides (IPCW) is critical to the applications of PC in photonic integrated circuits. This paper discusses the highly efficient coupling from surface PCWs into IPCW based on all-PC structures by a modified taper at the interface. The introduction of the modified taper is aimed to compress gradually the extended field propagating at the surface as well as excite the surface mode at the modified oblique surface. Good matching of modal field profiles on the both sides of the interface is achieved by keeping the waveguide structures changeless. The numerical results based on finite-difference time-domain simulations show that the bandwidth for coupling efficiency >90% can be as broad as about 80 nm.