Cargando…
Uncovering the Evolution of Low-Energy Plasmons in Nanopatterned Aluminum Plasmonics on Graphene
[Image: see text] We report adjusting the charge-transfer-plasmon (CTP) resonances of aluminum (Al) bowties on suspended monolayer graphene via controlled nanofabrication and focused electron-beam irradiation. CTP resonances of bowties with a conductive junction blue-shift with an increase in juncti...
Autores principales: | , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2022
|
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9335878/ https://www.ncbi.nlm.nih.gov/pubmed/35820031 http://dx.doi.org/10.1021/acs.nanolett.2c01512 |
_version_ | 1784759430494027776 |
---|---|
author | Elibol, Kenan van Aken, Peter A. |
author_facet | Elibol, Kenan van Aken, Peter A. |
author_sort | Elibol, Kenan |
collection | PubMed |
description | [Image: see text] We report adjusting the charge-transfer-plasmon (CTP) resonances of aluminum (Al) bowties on suspended monolayer graphene via controlled nanofabrication and focused electron-beam irradiation. CTP resonances of bowties with a conductive junction blue-shift with an increase in junction width, whereas their 3λ/2 and λ resonances barely red-shift. These plasmon modes are derived and confirmed by an LC circuit model and electromagnetic simulations performed with boundary-element and frequency-domain methods. A monotonic decay of the CTP lifetime is observed, while the junction width is extended. Instead, the lifetimes of 3λ/2 and λ resonances are nearly independent of junction width. When the junction is shrunk by electron-beam irradiation, all antenna resonances red-shift. Having created an electron-beam-induced sub 5 nm gap in bowties, we monitor the unambiguous transition of a CTP into a bonding-type gap mode, which is highly sensitive to the separation distance. Meanwhile, the 3λ/2 and λ resonances evolve into dipolar bright and dipolar dark modes. |
format | Online Article Text |
id | pubmed-9335878 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-93358782022-07-30 Uncovering the Evolution of Low-Energy Plasmons in Nanopatterned Aluminum Plasmonics on Graphene Elibol, Kenan van Aken, Peter A. Nano Lett [Image: see text] We report adjusting the charge-transfer-plasmon (CTP) resonances of aluminum (Al) bowties on suspended monolayer graphene via controlled nanofabrication and focused electron-beam irradiation. CTP resonances of bowties with a conductive junction blue-shift with an increase in junction width, whereas their 3λ/2 and λ resonances barely red-shift. These plasmon modes are derived and confirmed by an LC circuit model and electromagnetic simulations performed with boundary-element and frequency-domain methods. A monotonic decay of the CTP lifetime is observed, while the junction width is extended. Instead, the lifetimes of 3λ/2 and λ resonances are nearly independent of junction width. When the junction is shrunk by electron-beam irradiation, all antenna resonances red-shift. Having created an electron-beam-induced sub 5 nm gap in bowties, we monitor the unambiguous transition of a CTP into a bonding-type gap mode, which is highly sensitive to the separation distance. Meanwhile, the 3λ/2 and λ resonances evolve into dipolar bright and dipolar dark modes. American Chemical Society 2022-07-12 2022-07-27 /pmc/articles/PMC9335878/ /pubmed/35820031 http://dx.doi.org/10.1021/acs.nanolett.2c01512 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Elibol, Kenan van Aken, Peter A. Uncovering the Evolution of Low-Energy Plasmons in Nanopatterned Aluminum Plasmonics on Graphene |
title | Uncovering
the Evolution of Low-Energy Plasmons in
Nanopatterned Aluminum Plasmonics on Graphene |
title_full | Uncovering
the Evolution of Low-Energy Plasmons in
Nanopatterned Aluminum Plasmonics on Graphene |
title_fullStr | Uncovering
the Evolution of Low-Energy Plasmons in
Nanopatterned Aluminum Plasmonics on Graphene |
title_full_unstemmed | Uncovering
the Evolution of Low-Energy Plasmons in
Nanopatterned Aluminum Plasmonics on Graphene |
title_short | Uncovering
the Evolution of Low-Energy Plasmons in
Nanopatterned Aluminum Plasmonics on Graphene |
title_sort | uncovering
the evolution of low-energy plasmons in
nanopatterned aluminum plasmonics on graphene |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9335878/ https://www.ncbi.nlm.nih.gov/pubmed/35820031 http://dx.doi.org/10.1021/acs.nanolett.2c01512 |
work_keys_str_mv | AT elibolkenan uncoveringtheevolutionoflowenergyplasmonsinnanopatternedaluminumplasmonicsongraphene AT vanakenpetera uncoveringtheevolutionoflowenergyplasmonsinnanopatternedaluminumplasmonicsongraphene |