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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 18 — Jun. 20, 2011
  • pp: 2846–2854

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, and Sung June Kim  »View Author Affiliations


Applied Optics, Vol. 50, Issue 18, pp. 2846-2854 (2011)
http://dx.doi.org/10.1364/AO.50.002846


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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.

© 2011 Optical Society of America

OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(240.6680) Optics at surfaces : Surface plasmons
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Diffraction and Gratings

History
Original Manuscript: January 13, 2011
Revised Manuscript: March 26, 2011
Manuscript Accepted: April 7, 2011
Published: June 10, 2011

Citation
Seong Min Jang, Donghyun Kim, Seung Ho Choi, Kyung Min Byun, and Sung June Kim, "Enhancement of localized surface plasmon resonance detection by incorporating metal-dielectric double-layered subwavelength gratings," Appl. Opt. 50, 2846-2854 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-18-2846

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Supplementary Material


» Media 1: AVI (2387 KB)     

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