基于近场相位调控的高分辨定向色彩路由

项目名称： 基于近场相位调控的高分辨定向色彩路由

项目编号： No.11204146

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 物理学I

项目作者： 徐华

作者单位： 宁波大学

项目金额： 30万元

中文摘要： 近场光学相位调控可驱动光频区负折射、等离子体诱导电磁感应透明和Fano共振等物理效应，最近有研究显示在金、银纳米颗粒对阵列中进行相位调控可实现亚波长双通道定向色彩路由。为进一步探索新型定向色彩路由策略，提高路由分辨率，本项目计划研究等离子体双暗态共振的近场相位变化规律，波长可调特性及偏振依赖性。利用暗态共振线宽窄的特点与宽线宽的亮态共振耦合形成相位突变，从而将双通道分辨波长限制在亮态线宽内，使双通道定向色彩路由的分辨波长从仅能区分蓝光和红光（分辨率约150～200纳米）提高至50纳米以内，并进一步实现波长和偏振可控。通过FDTD设计、紫外光刻制备和搭建的leakage radiation光谱成像探测等理论和实验手段，系统研究基于等离子体双暗态共振的双通道定向色彩路由特性，揭示双暗态相位变化与双通道定向色散波长、角度和入射偏振之间的相互关系，旨在为片载光信号传输提供有力的支持。

中文关键词： 定向散射路由；电磁感应透明；双暗态共振；太赫兹；

英文摘要： Near-field optical phase manipulation can drive negative refraction at optical frequencies, plasmonic analogies of electromagnetically induced transprency, and Fano resonances. Recently, it was reported that the gold and silver bimetallic nanoparticles demonstrated the subwavelength directional color routing (DCR) by tuning the optical phase. In order to explore the novel scheme of DCR and further improve the resolution, this project plans to study the near-field phase evolution, the wavelength tunability, and the polarization dependence of plasmonic double dark resonances. Based on the double dark (or quasi-dark) resonance with a narrow linewidth coupled into the single bright resonance with a broad linewidth,giving rise to a sudden change in optical phase, the two-channel DCR can work within the linewidth of the bright-mode resonance. According to this scheme, the resolution can be improved to be less than 50 nm, and the tunability of wavelength and polarization can be achieved, while the gold and silver bimetallic nanoparticles only can distinguish the red light from the blue one (i.e., a resolution of 150 to 200 nm). With the aid of the FDTD calculations, the UV photolighography, and the leakage radiation spectroscopy, the properties of directional color routing originating from the plasmonic double dark res

英文关键词： directional color routing；electromagnetically induced transparency (EIT)；double-dark resonance； terahertz ；