基于表面等离激元的纳米金属/介质混合波导性质的研究
首发时间:2015-01-06
摘要:近些年来,面向高速发展的社会和急剧增长的信息量对光通信技术的重大需求,旨在解决传统光通信中器件体积大、速度慢、集成度低、衰减快等实际问题,研究表面等离激元(surface plasmon polaritions,SPPs)的新效应和新现象,在理论上和实验上实现微型化、集成化、功能化、高速化的纳米光子器件,为未来集成光学中的光信息的传输和处理提供新的依据和方法。本文研究的混合波导是由高折射率的半导体纳米线Si(圆柱型波导)嵌入到不同低折射率介质中,同时衬底是一块金属薄膜(SPP波导)形成的;其中低折射率介质包括氟化镁(MgF2)、二氧化硅(SiO2)、氧化铟锡(ITO)和二氧化钛(TiO2)。由于圆柱型介质波导和表面等离子体波导在中间低折射率介质层发生耦合形成混合等离子体波导,研究了这种波导的基本特性,包括波导的有效模面积,传播长度,模式特性,耦合强度和品质因数等。研究结果表明通过调整此结构的尺寸和电介质材料我们可以使传播距离达到毫米范围,同时仍保持有效模面积局域性。这种方法对于设计出高品质的等离子体纳米激光器非常重要同时也为实际的光学器件设计起到非常重要的作用。
关键词: 表面等离激元 混合波导 耦合强度 有效模面积 品质因数
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Hybrid Plasmonics Waveguide Properties of Dielectric Nanowires coupling with Metal Substrate
Abstract:In recent years, with the rapid growth of the society and the rapid development of information technology major needs optical communications, aimed at resolving the conventional optical communication devices large of volume, slow, low level of integration, and rapid decay and other practical problems, the researchers have proposed new effects and phenomenon of surface plasmon polaritions. In the theory and experiments realized of miniaturization, integration, functional, high-speed nano-photonic devices, it provided new evidence and methods of the optical information transmission and processing of the integrated optics in future.In this letter, we demonstrate a hybrid plasmonics waveguide system consisting of a high-permittivity semiconductor nanowire (cylinder waveguide) embedded in a low-permittivity dielectric near a metal surface (SP waveguide). We used the typical dielectric materials with relatively low to high refractive indices, including magnesium fluoride (MgF2), silica (SiO2), indium tin oxide (ITO) and titanium dioxide (TiO2), as surrounding dielectric layer. With the strong coupling between dielectric cylindrical waveguide mode and the long-range surface plasmon polaritons (LRSPP) mode of a thin metal film, the basic waveguiding properties, including the effective mode area, the propagation length, the mode character, the coupling strength and the figure of merit (FoM) can be achieved. We also found surface plasmon polaritons can travel over large distances with strong mode confinement for different surrounding material. It is important and useful to design high-quality plasmonics nanolaser and constructed practical nanoscale optical tweezers.
Keywords: Surface Plasmon Polaritons;hybrid waveguide;coupling strength;effective mode area FoM
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