Hierarchical Hybridization in Plasmonic Honeycomb Lattices
Hierarchical Hybridization in Plasmonic Honeycomb Lattices
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DOI：
10.1021/acs.nanolett.9b02661
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发表时间：
2019-09-01
期刊：
影响因子：
10.8
通讯作者：
Odom, Teri W.
中科院分区：
文献类型：
--
作者：
Li, Ran;Bourgeois, Marc R.;Odom, Teri W.
本文报道了分层杂化作为一种模式混合方案，以解释等离子体纳米粒子（NP）的非布拉维晶格的独特光学特性。由不同多极级（偶极和四极）的局域表面等离子体（LSP）介导的表面晶格共振（SLR）的形成可以导致纳米粒子周围的不对称电近场分布。这种不对称性是由于来自不同多极级的LSP的单个NP水平的LSP杂交以及来自相同多极级的LSP的晶胞水平（NP二聚体）的LSP杂交。银纳米粒子制成的蜂窝晶格在伽马点表现出超锐利的 SLR，这也可以促进纳米激光。受激发射过程的建模表明，晶格等离子体激元模式的多极分量负责激光发射的反馈。通过利用 Al NP 晶格中的多极 LSP 响应，我们从单个蜂窝晶格中获得了两种不同的伽马点带边模式。这项工作强调了具有非布拉维对称性的等离激元晶格中的多极 LSP 耦合如何对 SLR 的设计及其相关的等离激元近场分布产生重要影响。这些相对未经探索的自由度可以减少纳米级系统中的欧姆和辐射损耗，并使单反相机能够在光子学和纳米化学之间建立意想不到的联系。
This paper reports hierarchical hybridization as a mode-mixing scheme to account for the unique optical properties of non-Bravais lattices of plasmonic nanoparticles (NPs). The formation of surface lattice resonances (SLRs) mediated by localized surface plasmons (LSPs) of different multipolar orders (dipole and quadrupole) can result in asymmetric electric near-field distributions surrounding the NPs. This asymmetry is because of LSP hybridization at the individual NP level from LSPs of different multipole order and at the unit cell level (NP dimer) from LSPs of the same multipole order. Fabricated honeycomb lattices of silver NPs exhibit ultrasharp SLRs at the Gamma point that can also facilitate nanolasing. Modeling of the stimulated emission process revealed that the multipolar component of the lattice plasmon mode was responsible for feedback for lasing. By leveraging multipolar LSP responses in Al NP lattices, we achieved two distinct Gamma point band-edge modes from a single honeycomb lattice. This work highlights how multipolar LSP coupling in plasmonic lattices with a non-Bravais symmetry has important implications for the design of SLRs and their associated plasmonic near-field distributions. These relatively unexplored degrees of freedom can decrease both ohmic and radiative losses in nanoscale systems and enable SLRs to build unanticipated connections among photonics and nanochemistry.