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Air-like plasmonics with ultralow-refractive-index silica aerogels

Title
Air-like plasmonics with ultralow-refractive-index silica aerogels
Authors
Kim, YeonhongBaek, SeunghwaGupta, PrinceKim, ChangwookChang, KiseokRyu, Sung-PilKang, HansaemKim, Wook SungKIM, WOOKSUNGMyoung, JaeminPark, WounjhangKim, Kyoungsik
POSTECH Authors
KIM, WOOKSUNG
Date Issued
Feb-2019
Publisher
NATURE PUBLISHING GROUP
Abstract
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.
URI
http://oasis.postech.ac.kr/handle/2014.oak/94898
DOI
10.1038/s41598-019-38859-2
ISSN
2045-2322
Article Type
Article
Citation
Scientific Reports, vol. 9, page. 1 - 9, 2019-02
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 KIM, WOOKSUNG
Dept of Electrical Enginrg
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