Cargando…
Air-like plasmonics with ultralow-refractive-index silica aerogels
The coupling of the surface plasmon near-field into the sensing medium is key to the sensitivity of surface plasmon-based sensing devices. A low-index dielectric is necessary for the sensing medium to support a highly-penetrating surface plasmon evanescent field that extends well into the dielectric...
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/PMC6381121/ https://www.ncbi.nlm.nih.gov/pubmed/30783170 http://dx.doi.org/10.1038/s41598-019-38859-2 |
_version_ | 1783396426131177472 |
---|---|
author | Kim, Yeonhong Baek, Seunghwa Gupta, Prince Kim, Changwook Chang, Kiseok Ryu, Sung-Pil Kang, Hansaem Kim, Wook Sung Myoung, Jaemin Park, Wounjhang Kim, Kyoungsik |
author_facet | Kim, Yeonhong Baek, Seunghwa Gupta, Prince Kim, Changwook Chang, Kiseok Ryu, Sung-Pil Kang, Hansaem Kim, Wook Sung Myoung, Jaemin Park, Wounjhang Kim, Kyoungsik |
author_sort | Kim, Yeonhong |
collection | PubMed |
description | The coupling of the surface plasmon near-field into the sensing medium is key to the sensitivity of surface plasmon-based sensing devices. A low-index dielectric is necessary for the sensing medium to support a highly-penetrating surface plasmon evanescent field that extends well into the dielectric medium. The air-like refractive index, n, of an aerogel substrate provides another dimension for ultralow-index plasmonic devices. In this paper, we experimentally observed an angular surface plasmon resonance dip at 74° with the ultralow-index aerogel substrate, as was expected from theory. We also demonstrated the comparatively high-sensitivity surface plasmon resonance wavelength, λ, while the change in Δλ/Δn with different substrates was studied in detail. A 740 nm-period metal grating was imprinted on aerogel (n = 1.08) and polydimethylsiloxane (PDMS; n = 1.4) substrates. The ultraviolet–visible–near-infrared spectra were observed in the reflection mode on the grating, resulting in sensitivities of 740.2 and 655.9 nm/RIU for the aerogel and PDMS substrates, respectively. Numerical simulations were performed to understand the near-field of the surface plasmon, which demonstrated resonances well correlated with the experimentally observed results. The near-field due to excitation of the surface plasmon polaritons is observed to be more confined and to penetrate deeper into the sensing medium when a low-index substrate is used. |
format | Online Article Text |
id | pubmed-6381121 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-63811212019-02-22 Air-like plasmonics with ultralow-refractive-index silica aerogels Kim, Yeonhong Baek, Seunghwa Gupta, Prince Kim, Changwook Chang, Kiseok Ryu, Sung-Pil Kang, Hansaem Kim, Wook Sung Myoung, Jaemin Park, Wounjhang Kim, Kyoungsik Sci Rep Article The coupling of the surface plasmon near-field into the sensing medium is key to the sensitivity of surface plasmon-based sensing devices. A low-index dielectric is necessary for the sensing medium to support a highly-penetrating surface plasmon evanescent field that extends well into the dielectric medium. The air-like refractive index, n, of an aerogel substrate provides another dimension for ultralow-index plasmonic devices. In this paper, we experimentally observed an angular surface plasmon resonance dip at 74° with the ultralow-index aerogel substrate, as was expected from theory. We also demonstrated the comparatively high-sensitivity surface plasmon resonance wavelength, λ, while the change in Δλ/Δn with different substrates was studied in detail. A 740 nm-period metal grating was imprinted on aerogel (n = 1.08) and polydimethylsiloxane (PDMS; n = 1.4) substrates. The ultraviolet–visible–near-infrared spectra were observed in the reflection mode on the grating, resulting in sensitivities of 740.2 and 655.9 nm/RIU for the aerogel and PDMS substrates, respectively. Numerical simulations were performed to understand the near-field of the surface plasmon, which demonstrated resonances well correlated with the experimentally observed results. The near-field due to excitation of the surface plasmon polaritons is observed to be more confined and to penetrate deeper into the sensing medium when a low-index substrate is used. Nature Publishing Group UK 2019-02-19 /pmc/articles/PMC6381121/ /pubmed/30783170 http://dx.doi.org/10.1038/s41598-019-38859-2 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 Kim, Yeonhong Baek, Seunghwa Gupta, Prince Kim, Changwook Chang, Kiseok Ryu, Sung-Pil Kang, Hansaem Kim, Wook Sung Myoung, Jaemin Park, Wounjhang Kim, Kyoungsik Air-like plasmonics with ultralow-refractive-index silica aerogels |
title | Air-like plasmonics with ultralow-refractive-index silica aerogels |
title_full | Air-like plasmonics with ultralow-refractive-index silica aerogels |
title_fullStr | Air-like plasmonics with ultralow-refractive-index silica aerogels |
title_full_unstemmed | Air-like plasmonics with ultralow-refractive-index silica aerogels |
title_short | Air-like plasmonics with ultralow-refractive-index silica aerogels |
title_sort | air-like plasmonics with ultralow-refractive-index silica aerogels |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6381121/ https://www.ncbi.nlm.nih.gov/pubmed/30783170 http://dx.doi.org/10.1038/s41598-019-38859-2 |
work_keys_str_mv | AT kimyeonhong airlikeplasmonicswithultralowrefractiveindexsilicaaerogels AT baekseunghwa airlikeplasmonicswithultralowrefractiveindexsilicaaerogels AT guptaprince airlikeplasmonicswithultralowrefractiveindexsilicaaerogels AT kimchangwook airlikeplasmonicswithultralowrefractiveindexsilicaaerogels AT changkiseok airlikeplasmonicswithultralowrefractiveindexsilicaaerogels AT ryusungpil airlikeplasmonicswithultralowrefractiveindexsilicaaerogels AT kanghansaem airlikeplasmonicswithultralowrefractiveindexsilicaaerogels AT kimwooksung airlikeplasmonicswithultralowrefractiveindexsilicaaerogels AT myoungjaemin airlikeplasmonicswithultralowrefractiveindexsilicaaerogels AT parkwounjhang airlikeplasmonicswithultralowrefractiveindexsilicaaerogels AT kimkyoungsik airlikeplasmonicswithultralowrefractiveindexsilicaaerogels |