| 一维等离激元晶格中的能带结构调控 |
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| 引用本文： | 曹凤朝,吕博昆,丁宇峰,石锦卫.一维等离激元晶格中的能带结构调控[J].人工晶体学报,2021,50(7):1259-1274. |
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| 作者姓名： | 曹凤朝 吕博昆 丁宇峰 石锦卫 |
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| 作者单位： | 1.北京师范大学物理学系,应用光学北京市重点实验室,北京 100875; 2.季华实验室,佛山 528000 |
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| 基金项目： | 国家自然科学基金(91950108,11774035,11674032) |
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| 摘 要： | 由于具有将电磁波聚集到深亚波长体积的能力,表面等离激元在纳米光子技术研究工作中得到了广泛的应用。根据其性质,表面等离激元基本可以分为两大类:沿金属与介质界面传播的表面等离极化激元(SPPs)和束缚在金属表面的局域表面等离激元(LSPRs)。SPPs和对应的自由空间电磁波之间存在明显的动量失配,光栅,即一维等离激元晶格,经常被用于弥补动量失配,从自由空间激发SPPs。LSPRs是指在外部光场激发下局域在单个纳米结构周围的表面等离激元。当LSPRs被激发时,会形成近场增强效应,增大对入射光的吸收和散射。事实上,一维等离激元晶格既支持SPPs又支持LSPRs,是研究表面等离激元及其光学性质的很好的基本结构。由于LSPR这个自由度的存在,其中存在着比光子晶体更丰富的能带结构。本文将以一维等离激元晶格为研究对象,分别从能带调控、表面晶格共振、连续域中的束缚态以及玻色-爱因斯坦凝聚四个方面阐述金属等离激元的新颖性质和最新进展。这些性质对于进一步推动表面等离激元的应用具有重要意义。
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| 关 键 词： | 表面等离激元 能带调控 强耦合 表面晶格共振 连续域中的束缚态 玻色-爱因斯坦凝聚 |
| 收稿时间： | 2021-05-11 |
Energy Band Structure Control in One Dimensional Plasmonic Lattice |
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| CAO Fengzhao,LYU Bokun,DING Yufeng,SHI Jinwei.Energy Band Structure Control in One Dimensional Plasmonic Lattice[J].Journal of Synthetic Crystals,2021,50(7):1259-1274. |
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| Authors: | CAO Fengzhao LYU Bokun DING Yufeng SHI Jinwei |
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| Affiliation: | 1. Applied Optics Beijing Area Major Laboratory, Department of Physics, Beijing Normal University, Beijing 100875, China; 2. Jihua Laboratory, Foshan 528000, China |
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| Abstract: | Due to its ability to concentrate electromagnetic waves into deep sub-wavelength volume, surface plasmons have been widely used in nanophotonics. Generally, surface plasmons can be divided into two categories: surface plasmon polaritons (SPPs) propagating along the interface between metal and medium, and localized surface plasmon resonance (LSPRs) bound to metal surface. There is an obvious momentum mismatch between SPPs and the corresponding free space electromagnetic wave. Grating, i.e. one-dimensional plasmonic lattice, is often used to compensate for this momentum mismatch and launch SPPs from free space. LSPRs refer to the surface plasmon localized around a single nanostructure under external light field excitation. When LSPRs are launched, the near-field enhancement effect can greatly increase the absorption and scattering of the incident light. In fact, one dimensional plasmon lattice supports both SPPs and LSPRs, which is an excellent foundamental structure for studying surface plasmon and its optical properties. Due to the coexistence of LSPR, there are much richer energy band structures in plasmonic lattice than in photonic crystals. In this review, we focus on one-dimensional plasmon lattice, and discuss the novel properties of metal plasmon from four aspects: band control, surface lattice resonance, bound states in continuum and Bose-Einstein condensation. These properties are of great significance to further promote the application of surface plasmon. |
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| Keywords: | surface plasmon energy band control strong coupling surface lattice resonance bound states in continuum Bose-Einstein condensation |
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