纳米腔中不均匀等离子体场分布的观察。
Observation of inhomogeneous plasmonic field distribution in a nanocavity.
机构信息
College of Energy, State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, College of Chemistry and Chemical Engineering, College of Energy, College of Materials, Xiamen University, Xiamen, China.
Collaborative Innovation Center of Chemistry for Energy Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, MOE Key Laboratory of Computational Physical Sciences, Department of Chemistry, Fudan University, Shanghai, China.
出版信息
Nat Nanotechnol. 2020 Nov;15(11):922-926. doi: 10.1038/s41565-020-0753-y. Epub 2020 Aug 10.
The progress of plasmon-based technologies relies on an understanding of the properties of the enhanced electromagnetic fields generated by the coupling nanostrucutres. Plasmon-enhanced applications include advanced spectroscopies, optomechanics, optomagnetics and biosensing. However, precise determination of plasmon field intensity distribution within a nanogap remains challenging. Here, we demonstrate a molecular ruler made from a set of viologen-based, self-assembly monolayers with which we precisely measures field distribution within a plasmon nanocavity with ~2-Å spatial resolution. We observed an unusually large plasmon field intensity inhomogeneity that we attribute to the formation of a plasmonic comb in the nanocavity. As a consequence, we posit that the generally adopted continuous media approximation for molecular monolayers should be used carefully.
基于等离子体的技术的进展依赖于对耦合纳米结构产生的增强电磁场的特性的理解。等离子体增强的应用包括先进的光谱学、光机械学、光磁学和生物传感。然而，在纳米间隙内精确确定等离子体场强度分布仍然具有挑战性。在这里，我们展示了一个由一组基于二茂铁的自组装单层组成的分子标尺，我们用它精确地测量了等离子体纳米腔中的场分布，空间分辨率约为 2-Å。我们观察到了一个异常大的等离子体场强度不均匀性，我们将其归因于纳米腔中形成的等离子体梳。因此，我们认为对于分子单层通常采用的连续介质近似应该谨慎使用。
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