Observation of inhomogeneous plasmonic field distribution in a nanocavity
| Autor: | Shu Chen, Murugavel Kathiresan, Jian-Feng Li, Yi Luo, Chao-Yu Li, Bao-Ying Wen, Sai Duan, Li-Qiang Xie, Song-Bo Li, Zhong-Qun Tian, Jason R. Anema, Bing-Wei Mao |
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| Rok vydání: | 2020 |
| Předmět: |
Electromagnetic field
Materials science Field (physics) Biomedical Engineering Physics::Optics Bioengineering 02 engineering and technology 010402 general chemistry 01 natural sciences symbols.namesake Monolayer Physics::Atomic and Molecular Clusters General Materials Science Electrical and Electronic Engineering Image resolution Plasmon Coupling business.industry Resolution (electron density) 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics 0104 chemical sciences symbols Optoelectronics 0210 nano-technology Raman spectroscopy business |
| Zdroj: | Nature Nanotechnology. 15:922-926 |
| ISSN: | 1748-3395 1748-3387 |
| Popis: | The progress of plasmon-based technologies relies on an understanding of the properties of the enhanced electromagnetic fields generated by the coupling nanostrucutres1–6. Plasmon-enhanced applications include advanced spectroscopies7–10, optomechanics11, optomagnetics12 and biosensing13–17. 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 ~2-A 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. The strength of the plasmonic field between a plasmonic particle and a Au surface can be measured at ~2-A resolution by following the Raman peaks of a suitably labelled self-assembly monolayer. |
| Databáze: | OpenAIRE |
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