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Keywords = sub-femtometer

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10 pages, 3039 KiB  
Article
Graphene Plasmon Resonances for Electrically-Tunable Sub-Femtometer Dimensional Resolution
by Zhiyong Wu, Lei Zhang, Min Zhang, Irene Ling Li, Hong Su, Huancheng Zhao, Shuangchen Ruan and Huawei Liang
Nanomaterials 2020, 10(7), 1381; https://doi.org/10.3390/nano10071381 - 15 Jul 2020
Cited by 3 | Viewed by 2461
Abstract
A coupled graphene structure (CGS) is proposed to obtain an electrically tunable sub-femtometer (sub-fm) dimensional resolution. According to analytical and numerical investigations, the CGS can support two branches of localized surface plasmon resonances (LSPRs), which park at the dielectric spacer between two pieces [...] Read more.
A coupled graphene structure (CGS) is proposed to obtain an electrically tunable sub-femtometer (sub-fm) dimensional resolution. According to analytical and numerical investigations, the CGS can support two branches of localized surface plasmon resonances (LSPRs), which park at the dielectric spacer between two pieces of graphene. The coupled efficiencies of the odd-order modes are even four orders of magnitude higher than that of the even-order modes. In particular, a sub-fm resolution for detecting the change in the spacer thickness can be reached using the lowest order LSPR mode. The LSPR wavelength and the dimensional differential resolution can be electrically-tuned from 9.5 to 33 μm and from 4.3 to 15 nm/pm, respectively, by modifying the chemical potential of the graphene via the gate voltage. Furthermore, by replacing the graphene ribbon (GR) at the top of the CGS with multiple GRs of different widths, a resonant frequency comb in the absorption spectrum with a tunable frequency interval is generated, which can be used to detect the changes in spacer thicknesses at different locations with sub-fm resolution. Full article
(This article belongs to the Section Theory and Simulation of Nanostructures)
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