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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 10 — Apr. 1, 2014
  • pp: 2152–2157

Plasmonic metal–dielectric–metal stack structure with subwavelength metallic gratings for improving sensor sensitivity and signal quality

Sherif H. El-Gohary, Jong Min Choi, Nak-Hyeon Kim, and Kyung Min Byun  »View Author Affiliations

Applied Optics, Vol. 53, Issue 10, pp. 2152-2157 (2014)

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In this study, we investigated the performance improvement of a localized surface plasmon resonance (LSPR) biosensor by incorporating a metal–dielectric–metal (MDM) stack structure and subwavelength metallic nanograting. The numerical results showed that the LSPR substrate with a MDM stack can provide not only a better sensitivity by more than five times but also a notably improved signal quality. While the gold nanogratings on a gold film inevitably lead to a broad and shallow reflectance curve, the presence of a MDM stack can prevent propagating surface plasmons from interference by locally enhanced fields excited at the gold nanogratings, finally resulting in a strong and deep absorption band at resonance. Therefore, the proposed LSPR structure could potentially open a new possibility of enhanced detection for monitoring biomolecular interactions of very low molecular weights.

© 2014 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(280.1415) Remote sensing and sensors : Biological sensing and sensors
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Remote Sensing and Sensors

Original Manuscript: December 13, 2013
Revised Manuscript: February 13, 2014
Manuscript Accepted: February 26, 2014
Published: March 28, 2014

Virtual Issues
Vol. 9, Iss. 6 Virtual Journal for Biomedical Optics

Sherif H. El-Gohary, Jong Min Choi, Nak-Hyeon Kim, and Kyung Min Byun, "Plasmonic metal–dielectric–metal stack structure with subwavelength metallic gratings for improving sensor sensitivity and signal quality," Appl. Opt. 53, 2152-2157 (2014)

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