Plasmonic modes confined to metallic nanostructures at the atomic and molecular scale push the boundaries of light–matter interactions. Within these extreme plasmonic structures of ultrathin nanogaps, coupled nanoparticles, and tunnelling junctions, new physical phenomena arise when plasmon resonances couple to electronic, exitonic, or vibrational excitations, as well as the efficient generation of non-radiative hot carriers. This review surveys the latest experimental and theoretical advances in the regime of extreme nano-plasmonics, with an emphasis on plasmon-induced hot carriers, strong coupling effects, and electrically driven processes at the molecular scale. We will also highlight related nanophotonic and optoelectronic applications including plasmon-enhanced molecular light sources, photocatalysis, photodetection, and strong coupling with low dimensional materials.

中文翻译：

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分子级纳米光子学：热载流子、强耦合和电驱动等离子体过程

仅限于原子和分子尺度金属纳米结构的等离子体模式突破了光与物质相互作用的界限。在这些由超薄纳米间隙、耦合纳米颗粒和隧道结组成的极端等离子体结构中，当等离子体共振与电子、激子或振动激发耦合以及有效生成非辐射热载流子时，就会出现新的物理现象。这篇综述调查了极端纳米等离子体激元领域的最新实验和理论进展，重点是等离子体激元诱导的热载流子、强耦合效应和分子尺度的电驱动过程。我们还将重点介绍相关的纳米光子和光电应用，包括等离子体增强分子光源、光催化、光电检测以及与低维材料的强耦合。