Wang Danqing, Hu Jingtian, Schatz George C, Odom Teri W
J Phys Chem Lett. 2023 Sep 28;14(38):8525-8530. doi: 10.1021/acs.jpclett.3c02158. Epub 2023 Sep 18.
This paper describes how two-dimensional plasmonic nanoparticle lattices covered with microscale arrays of dielectric patches can show superlattice surface lattice resonances (SLRs). These optical resonances originate from multiscale diffractive coupling that can be controlled by the periodicity and size of the patterned dielectrics. The features in the optical dispersion diagram are similar to those of index-matched microscale arrays of metal nanoparticle lattices, having the same lateral dimensions as the dielectric patches. With an increase in nanoparticle size, superlattice SLRs can also support quadrupole excitations with distinct dispersion diagrams. The tunable optical band structure enabled by patterned dielectrics on plasmonic nanoparticle arrays offers prospects for enhanced nonlinear optics, nanoscale lasing, and engineered parity-time symmetries.
本文描述了覆盖有介电贴片微尺度阵列的二维等离子体纳米颗粒晶格如何能够展现超晶格表面晶格共振（SLR）。这些光学共振源于多尺度衍射耦合，其可通过图案化介电材料的周期性和尺寸来控制。光学色散图中的特征与具有与介电贴片相同横向尺寸的金属纳米颗粒晶格的折射率匹配微尺度阵列的特征相似。随着纳米颗粒尺寸的增加，超晶格SLR还可以支持具有不同色散图的四极激发。等离子体纳米颗粒阵列上的图案化介电材料所实现的可调谐光学能带结构为增强非线性光学、纳米级激光以及工程化宇称 - 时间对称性提供了前景。
