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

Yeonhong Kim, Seunghwa Baek, Prince Gupta, Changwook Kim, Kiseok Chang, Sung Pil Ryu, Hansaem Kang, Wook Sung Kim, Jaemin Myoung, Wounjhang Park, Kyoungsik Kim

Research output: Contribution to journalArticle

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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.

Original languageEnglish
Article number2265
JournalScientific reports
Volume9
Issue number1
DOIs
Publication statusPublished - 2019 Dec 1

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Refractometry
Surface Plasmon Resonance
Silicon Dioxide
Air
Equipment and Supplies
Metals
baysilon

All Science Journal Classification (ASJC) codes

  • General

Cite this

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. In: Scientific reports. 2019 ; Vol. 9, No. 1.
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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.",
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Kim, Y, Baek, S, Gupta, P, Kim, C, Chang, K, Ryu, SP, Kang, H, Kim, WS, Myoung, J, Park, W & Kim, K 2019, 'Air-like plasmonics with ultralow-refractive-index silica aerogels', Scientific reports, vol. 9, no. 1, 2265. https://doi.org/10.1038/s41598-019-38859-2

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.

In: Scientific reports, Vol. 9, No. 1, 2265, 01.12.2019.

Research output: Contribution to journalArticle

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