Holmgaard Tobias, Gosciniak Jacek, Bozhevolnyi Sergey I
Department of Physics and Nanotechnology, Aalborg University, Skjernvej 4A, DK-9220 Aalborg Øst, Denmark.
Opt Express. 2010 Oct 25;18(22):23009-15. doi: 10.1364/OE.18.023009.
A waveguiding configuration for surface plasmon polaritons (SPPs) featuring simultaneously a tight mode confinement and long propagation (several millimeters) at telecom wavelengths is proposed and analyzed using the finite-element method. The configuration represents a long-range dielectric-loaded SPP waveguide (LR-DLSPPW), in which a thin and narrow metal stripe is sandwiched between a square dielectric ridge and a dielectric film supported by a low-index substrate. Considering optical polymers, for example, we calculated that a 15-nm-thick and 500-nm-wide gold stripe placed on a 460 nm thick medium-index (1.49) layer supported by a low-index (1.34) substrate and topped by a 850 × 850 nm(2) high-index (1.535) ridge supports a fundamental LR-DLSPPW mode having width of 1.6 μm and propagating over 3.1 mm at the wavelength λ = 1.55 μm. The proposed configuration allows for easy connection to electrodes enabling, e.g., thermo- or electro-optic control, and is technologically simple being compatible with planar fabrication using UV-lithography.
提出了一种用于表面等离激元极化激元（SPP）的波导结构，该结构在电信波长下同时具有紧密的模式限制和长距离传播（几毫米）特性，并使用有限元方法进行了分析。该结构代表一种长程介质加载SPP波导（LR-DLSPPW），其中一条薄而窄的金属条夹在方形介质脊和由低折射率衬底支撑的介质膜之间。例如，考虑光学聚合物，我们计算得出，放置在由低折射率（1.34）衬底支撑且顶部有850×850 nm²高折射率（1.535）脊的460 nm厚中折射率（1.49）层上的15 nm厚、500 nm宽的金条纹，支持一种基本的LR-DLSPPW模式，其宽度为1.6μm，在波长λ = 1.55μm下传播超过3.1 mm。所提出的结构便于与电极连接，例如实现热光或电光控制，并且在技术上简单，与使用紫外光刻的平面制造兼容。
