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Optical responses of a metal with sub-nm gaps
Cited 6 time in
Web of Science
Cited 6 time in Scopus
- Authors
- Issue Date
- 2016-03
- Publisher
- Nature Publishing Group
- Citation
- Scientific Reports, Vol.6, p. 22981
- Abstract
- If the size of a metallic structure is reduced to be comparable to or even smaller than the typical quantum-mechanical lengths such as the Fermi wavelength or Thomas-Fermi wavelength, the electronic structure and optical responses are modulated by quantum effects. Here, we calculate the optical responses of a metal with sub-nm gaps using the eigenstates obtained from an effective-mass quantum theory. According to our simulation, the dielectric responses can be significantly modified by tuning the inter-gap distances. Remarkably, sub-nm gaps occupying a 0.3% volumetric fraction can elongate the penetration depth by an order of magnitude in the terahertz regime. We find that the detailed dependences of electron-photon interaction matrix elements on the involved electronic wavefunctions play an important role in the optical responses. The results draw our attention to these recently fabricated systems.
- ISSN
- 2045-2322
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