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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 3 — Jan. 30, 2012
  • pp: 2587–2597

Electron beam lithography designed silver nano-disks used as label free nano-biosensors based on localized surface plasmon resonance

Neval A. Cinel, Serkan Bütün, and Ekmel Özbay  »View Author Affiliations

Optics Express, Vol. 20, Issue 3, pp. 2587-2597 (2012)

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We present a label-free, optical nano-biosensor based on the Localized Surface Plasmon Resonance (LSPR) that is observed at the metal-dielectric interface of silver nano-disk arrays located periodically on a sapphire substrate by Electron-Beam Lithography (EBL). The nano-disk array was designed by finite-difference and time-domain (FDTD) algorithm-based simulations. Refractive index sensitivity was calculated experimentally as 221-354 nm/RIU for different sized arrays. The sensing mechanism was first tested with a biotin-avidin pair, and then a preliminary trial for sensing heat-killed Escherichia coli (E. coli) O157:H7 bacteria was done. Although the study is at an early stage, the results indicate that such a plasmonic structure can be applied to bio-sensing applications and then extended to the detection of specific bacteria species as a fast and low cost alternative.

© 2012 OSA

OCIS Codes
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(240.6680) Optics at surfaces : Surface plasmons
(280.1415) Remote sensing and sensors : Biological sensing and sensors
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:

Original Manuscript: December 1, 2011
Revised Manuscript: December 31, 2011
Manuscript Accepted: January 3, 2012
Published: January 20, 2012

Virtual Issues
Vol. 7, Iss. 3 Virtual Journal for Biomedical Optics

Neval A. Cinel, Serkan Bütün, and Ekmel Özbay, "Electron beam lithography designed silver nano-disks used as label free nano-biosensors based on localized surface plasmon resonance," Opt. Express 20, 2587-2597 (2012)

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