Emergent from the discrete spatial periodicity of plasmonic arrays, surface lattice resonances (SLRs) are characterized as dispersive, high-quality polaritonic modes that can be selectively excited at specific points in their photonic band structure by plane-wave light of varying frequency, polarization, and angle of incidence. Room-temperature Bose–Einstein condensation of exciton polaritons, lasing, and nonlinear matter-wave physics have all found origins in SLR systems, but to date, little attention has been paid to their thermal behavior. Here, we combine analytical theory and numerical calculations to investigate the photothermal properties of SLRs in periodic 1D and 2D arrays of plasmonic nanoparticles coupled to each other and to the electromagnetic far-field via transverse radiation. Specifically, we demonstrate how to create steady-state SLR thermal gradients spanning from the nanoscale to hundreds of microns that are actively controllable using light in spite of heat diffusion. We also demonstrate the surprising ability to localize thermal gradients at the lattice edges in topologically non-trivial SLR dimer lattices, thereby establishing a class of extraordinary thermal responses that are unconventional in ordinary materials. This work exposes a new direction in thermoplasmonics that has only just now begun to be explored.

中文翻译：

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拓扑平凡和非平凡等离子体晶格中热分布的光学控制

表面晶格共振 (SLR) 源于等离子体阵列的离散空间周期性，其特点是具有色散性、高质量的极化模式，可以通过不同频率、极化、和入射角。激子极化激元的室温玻色-爱因斯坦凝聚、激光和非线性物质波物理学都在 SLR 系统中找到了起源，但迄今为止，很少有人关注它们的热行为。在这里，我们结合分析理论和数值计算来研究 SLR 在周期性 1D 和 2D 等离子纳米粒子阵列中的光热特性，这些纳米粒子相互耦合并通过横向辐射耦合到电磁远场。具体来说，我们演示了如何创建从纳米级到数百微米的稳态 SLR 热梯度，尽管存在热扩散，但仍可使用光主动控制。我们还展示了在拓扑非平凡的 SLR 二聚体晶格中将晶格边缘的热梯度定位的惊人能力，从而建立了一类在普通材料中非常规的非凡热响应。这项工作揭示了热等离子体学的一个新方向，该方向才刚刚开始探索。从而建立一类在普通材料中非常规的非凡热响应。这项工作揭示了热等离子体学的一个新方向，该方向才刚刚开始探索。从而建立一类在普通材料中非常规的非凡热响应。这项工作揭示了热等离子体学的一个新方向，该方向才刚刚开始探索。