Enhancement of localized surface plasmon resonance detection by incorporating metal-dielectric double-layered subwavelength gratings

Seong Min Jang, Donghyun Kim, Seung Ho Choi, Kyung Min Byun, Sung June Kim

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

In this study, we investigated the enhanced sensing performance of a localized surface plasmon resonance (LSPR) biosensor by employing metal-dielectric double-layered subwavelength grating structures. The numerical results showed that the LSPR substrate with a dielectric spacer can provide not only a better sensitivity but also a significantly improved reflectance characteristic. While the presence of metallic gratings leads to a broad and shallow reflectance curve inevitably, the dielectric spacer can prevent the propagating surface plasmons from being interfered by the locally enhanced fields excited at the gold gratings, finally resulting in a strong and deep absorption band at resonance. Therefore, the proposed structure could potentially open a new possibility of the enhanced LSPR detection for monitoring biomolecular interactions of low molecular weights.

Original languageEnglish
Pages (from-to)2846-2854
Number of pages9
JournalApplied Optics
Volume50
Issue number18
DOIs
Publication statusPublished - 2011 Jun 20

Fingerprint

Surface plasmon resonance
surface plasmon resonance
gratings
spacers
augmentation
Metals
metals
reflectance
Plasmons
low molecular weights
plasmons
bioinstrumentation
Biosensors
Absorption spectra
Gold
Molecular weight
gold
absorption spectra
Monitoring
sensitivity

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)

Cite this

Jang, Seong Min ; Kim, Donghyun ; Choi, Seung Ho ; Byun, Kyung Min ; Kim, Sung June. / Enhancement of localized surface plasmon resonance detection by incorporating metal-dielectric double-layered subwavelength gratings. In: Applied Optics. 2011 ; Vol. 50, No. 18. pp. 2846-2854.
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Enhancement of localized surface plasmon resonance detection by incorporating metal-dielectric double-layered subwavelength gratings. / Jang, Seong Min; Kim, Donghyun; Choi, Seung Ho; Byun, Kyung Min; Kim, Sung June.

In: Applied Optics, Vol. 50, No. 18, 20.06.2011, p. 2846-2854.

Research output: Contribution to journalArticle

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