Cargando…
Observation of Wavelength-Dependent Quantum Plasmon Tunneling with Varying the Thickness of Graphene Spacer
Plasmonic coupling provides a highly localized electromagnetic field in the gap of noble metals when illuminated by a light. The plasmonic field enhancement is generally known to be inversely proportional to the gap distance. Given such a relation, reducing the gap distance appears to be necessary t...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6362230/ https://www.ncbi.nlm.nih.gov/pubmed/30718711 http://dx.doi.org/10.1038/s41598-018-37882-z |
_version_ | 1783392862391500800 |
---|---|
author | Lee, Khang June Kim, Shinho Hong, Woonggi Park, Hamin Jang, Min Seok Yu, Kyoungsik Choi, Sung-Yool |
author_facet | Lee, Khang June Kim, Shinho Hong, Woonggi Park, Hamin Jang, Min Seok Yu, Kyoungsik Choi, Sung-Yool |
author_sort | Lee, Khang June |
collection | PubMed |
description | Plasmonic coupling provides a highly localized electromagnetic field in the gap of noble metals when illuminated by a light. The plasmonic field enhancement is generally known to be inversely proportional to the gap distance. Given such a relation, reducing the gap distance appears to be necessary to achieve the highest possible field enhancement. At the sub-nanometer scale, however, quantum mechanical effects have to be considered in relation to plasmonic coupling. Here, we use graphene as a spacer to observe plasmonic field enhancement in sub-nanometer gap. The gap distance is precisely controlled by the number of stacked graphene layers. We propose that the sudden drop of field enhancement for the single layer spacer is originated from the plasmon tunneling through the thin spacer. Numerical simulation which incorporates quantum tunneling is also performed to support the experimental results. From the fact that field enhancement with respect to the number of graphene layers exhibits different behavior in two wavelengths corresponding to on- and off-resonance conditions, tunneling phenomenon is thought to destroy the resonance conditions of plasmonic coupling. |
format | Online Article Text |
id | pubmed-6362230 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-63622302019-02-06 Observation of Wavelength-Dependent Quantum Plasmon Tunneling with Varying the Thickness of Graphene Spacer Lee, Khang June Kim, Shinho Hong, Woonggi Park, Hamin Jang, Min Seok Yu, Kyoungsik Choi, Sung-Yool Sci Rep Article Plasmonic coupling provides a highly localized electromagnetic field in the gap of noble metals when illuminated by a light. The plasmonic field enhancement is generally known to be inversely proportional to the gap distance. Given such a relation, reducing the gap distance appears to be necessary to achieve the highest possible field enhancement. At the sub-nanometer scale, however, quantum mechanical effects have to be considered in relation to plasmonic coupling. Here, we use graphene as a spacer to observe plasmonic field enhancement in sub-nanometer gap. The gap distance is precisely controlled by the number of stacked graphene layers. We propose that the sudden drop of field enhancement for the single layer spacer is originated from the plasmon tunneling through the thin spacer. Numerical simulation which incorporates quantum tunneling is also performed to support the experimental results. From the fact that field enhancement with respect to the number of graphene layers exhibits different behavior in two wavelengths corresponding to on- and off-resonance conditions, tunneling phenomenon is thought to destroy the resonance conditions of plasmonic coupling. Nature Publishing Group UK 2019-02-04 /pmc/articles/PMC6362230/ /pubmed/30718711 http://dx.doi.org/10.1038/s41598-018-37882-z Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Lee, Khang June Kim, Shinho Hong, Woonggi Park, Hamin Jang, Min Seok Yu, Kyoungsik Choi, Sung-Yool Observation of Wavelength-Dependent Quantum Plasmon Tunneling with Varying the Thickness of Graphene Spacer |
title | Observation of Wavelength-Dependent Quantum Plasmon Tunneling with Varying the Thickness of Graphene Spacer |
title_full | Observation of Wavelength-Dependent Quantum Plasmon Tunneling with Varying the Thickness of Graphene Spacer |
title_fullStr | Observation of Wavelength-Dependent Quantum Plasmon Tunneling with Varying the Thickness of Graphene Spacer |
title_full_unstemmed | Observation of Wavelength-Dependent Quantum Plasmon Tunneling with Varying the Thickness of Graphene Spacer |
title_short | Observation of Wavelength-Dependent Quantum Plasmon Tunneling with Varying the Thickness of Graphene Spacer |
title_sort | observation of wavelength-dependent quantum plasmon tunneling with varying the thickness of graphene spacer |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6362230/ https://www.ncbi.nlm.nih.gov/pubmed/30718711 http://dx.doi.org/10.1038/s41598-018-37882-z |
work_keys_str_mv | AT leekhangjune observationofwavelengthdependentquantumplasmontunnelingwithvaryingthethicknessofgraphenespacer AT kimshinho observationofwavelengthdependentquantumplasmontunnelingwithvaryingthethicknessofgraphenespacer AT hongwoonggi observationofwavelengthdependentquantumplasmontunnelingwithvaryingthethicknessofgraphenespacer AT parkhamin observationofwavelengthdependentquantumplasmontunnelingwithvaryingthethicknessofgraphenespacer AT jangminseok observationofwavelengthdependentquantumplasmontunnelingwithvaryingthethicknessofgraphenespacer AT yukyoungsik observationofwavelengthdependentquantumplasmontunnelingwithvaryingthethicknessofgraphenespacer AT choisungyool observationofwavelengthdependentquantumplasmontunnelingwithvaryingthethicknessofgraphenespacer |