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

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16 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

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All Science Journal Classification (ASJC) codes

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

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