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...

Descripción completa

Detalles Bibliográficos
Autores principales: Kim, Yeonhong, Baek, Seunghwa, Gupta, Prince, Kim, Changwook, Chang, Kiseok, Ryu, Sung-Pil, Kang, Hansaem, Kim, Wook Sung, Myoung, Jaemin, Park, Wounjhang, Kim, Kyoungsik
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