期刊
NATURE NANOTECHNOLOGY
卷 15, 期 11, 页码 922-+出版社
NATURE RESEARCH
DOI: 10.1038/s41565-020-0753-y
关键词
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资金
- National Natural Science Foundation of China [21925404, 21775127, 21427813, 21790350]
- National Key Research and Development Programme of China [2019YFA0705400, 2017YFA0303500]
- Anhui Initiative in Quantum Information Technologies [AHY090000]
- Shanghai Pujiang Programme [19PJ1400600]
The progress of plasmon-based technologies relies on an understanding of the properties of the enhanced electromagnetic fields generated by the coupling nanostrucutres(1-6). Plasmon-enhanced applications include advanced spectroscopies(7-10), optomechanics(11), optomagnetics(12) and biosensing(13-17). 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 similar to 2-angstrom 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.
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