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首页> 外文期刊>Plasmonics >Propagation Properties of Nanoscale Three-Dimensional Plasmonic Waveguide Based on Hybrid of Two Fundamental Planar Optical Metal Waveguides
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Propagation Properties of Nanoscale Three-Dimensional Plasmonic Waveguide Based on Hybrid of Two Fundamental Planar Optical Metal Waveguides

机译：基于两个基础平面光学金属波导的杂交的纳米级三维等离子体波导的传播特性

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摘要

In this paper, a nanoscale three-dimensional plasmonic waveguide (TDPW), created by depositing an Ag stripe on a SiO2 layer with an Ag substrate, is introduced and theoretically investigated at visible and telecom wavelengths. By applying the effective index method and finite-difference time-domain numerical simulations, the authors find that the propagation properties of surface plasmon polaritons (SPPs) in the TDPW, including the propagation length and beam width, are mainly decided by the core (the SiO2 layer just under the Ag stripe) itself, due to the much stronger localization of SPPs in the core than in the two side claddings (the SiO2 layer without the covered Ag stripe). And propagating SPPs in the TDPW are strongly confined in the core region, even with a very small waveguide cross section. Furthermore, based on the stronger localization of propagation SPPs in the TDPW, two kinds of bending waveguides, oblique bending and 90 degrees circular bending waveguides, are also investigated. For wavelength of 1550nm, the 90 degrees circular bending guide with a minimum radius as small as 2.6m show nearly zero radiation loss, even with a small waveguide cross section of 70x80nm(2). The proposed TDPW is suitable for planar integration and provides a possible way for constructing various nanoscale counterparts of conventional integrated devices such as splitter, resonator, sensor, and optical switch.
机译：在本文中，通过在具有Ag衬底的SiO 2层上沉积Ag条纹的纳米级三维等离子体波导（TDPW），并在可见光波长下理论地研究。通过应用有效的索引方法和有限差分时域数值模拟，作者发现TDPW中的表面等离子体极化子（SPP）的传播特性，包括传播长度和光束宽度主要由核心决定（ SiO2层刚刚在AG条纹下方）本身，由于芯中的SPP的定位大于两侧包层（没有覆盖AG条纹的SiO2层）。即使使用非常小的波导横截面，TDPW中的传播SPP在核心区域中强烈局限于核心区域。此外，基于TDPW中的传播SPP的较强定位，还研究了两种弯曲波导，倾斜弯曲和90度的圆形弯曲波导。对于1550nm的波长，90度圆形弯曲导向导向导向导向导向导向导向导向导向导向导向导向导向导向导向导向器小于2.6m的最小辐射损失几乎零辐射损失，即使是70x80nm（2）的小波导横截面。所提出的TDPW适用于平面集成，并提供一种用于构建传统集成装置的各种纳米级对应的方法，例如分离器，谐振器，传感器和光学开关。

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