具有长程传播和亚波长模式局域性的混合双楔形等离子体波导

摘要

提出一个混合双楔形等离子体波导,该波导由两个楔形介质波导和一个菱形金属线组成.电介质楔形波导模式和长程表面等离子体模式的耦合使得该波导可以获得低损耗的传播和超深的亚波长的模式局域性.混合双楔形等离子体波导在得到一个532 μm的传播长度的同时可以得到一个2.9×10-3的超小的归一化模式面积或者在得到一个6.2×10-3的归一化模式面积的同时可以得到一个3028 μm的超长的传播距离.此外,还研究了制作过程中可能存在的误差对该波导模式性质的影响.计算结果表明,该混合双楔形等离子体波导具有一定的制作容差性.%A hybrid dual wedge plasmonic (HDWP) waveguide consisting of two dielectric wedges and a diamond metal wire was proposed.The coupling between dielectric wedge waveguide mode and long-rang surface plasmon polariton mode results in both low propagation loss and ultra-deep-subwavelength confinement.The HDWP waveguide achieves a normalized mode area of 2.9 × 10-3 with a moderate propagation length of 532 μm or a propagation length of 3028 μm with a normalized mode area of 6.2 × 10-3.The impacts of possible fabrication imperfections on the mode properties are studied.The results indicate that the HDWP waveguide is quite tolerant to fabrication errors.