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JOURNAL OF SYNTHETIC CRYSTALS ›› 2021, Vol. 50 ›› Issue (7): 1259-1274.

Special Issue: 人工光/声微结构材料

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Energy Band Structure Control in One Dimensional Plasmonic Lattice

CAO Fengzhao1, LYU Bokun1, DING Yufeng1,2, SHI Jinwei1   

  1. 1. Applied Optics Beijing Area Major Laboratory, Department of Physics, Beijing Normal University, Beijing 100875, China;
    2. Jihua Laboratory, Foshan 528000, China
  • Received:2021-05-11 Online:2021-07-15 Published:2021-08-16

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.

Key words: surface plasmon, energy band control, strong coupling, surface lattice resonance, bound states in continuum, Bose-Einstein condensation

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