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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 24 — Nov. 21, 2011
  • pp: 24530–24539

Sensitive biosensors using Fano resonance in single gold nanoslit with periodic grooves

Kuang-Li Lee, Shu-Han Wu, Chia-Wei Lee, and Pei-Kuen Wei  »View Author Affiliations


Optics Express, Vol. 19, Issue 24, pp. 24530-24539 (2011)
http://dx.doi.org/10.1364/OE.19.024530


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Abstract

Chip-based biosensors for sensitive label-free detection were fabricated and tested by using Fano-type resonant nanostructures. The sensor was composed of a 190nm-thick gold nanoslit surrounded by 600-nm-period grooves. Transverse-magnetic polarized wave in these gold nanostructures generated asymmetrical resonant spectra due to the interference of broad-band cavity resonance in the single slit and narrow-band surface plasmon resonance on the periodic grooves. Compared to nanoslit arrays, such Fano-type sensor has a sharper resonance which yields a figure of merit up to 48. In addition, the crossed talk between sensing elements is reduced due to the Bragg reflection of the periodic grooves. A smaller detection separation down to 10μm width was achieved. An antigen-antibody interaction experiment in aqueous environment verified the detection sensitivity in surface binding event.

© 2011 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.3910) Physical optics : Metal optics
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Sensors

History
Original Manuscript: September 22, 2011
Revised Manuscript: November 2, 2011
Manuscript Accepted: November 9, 2011
Published: November 15, 2011

Virtual Issues
Vol. 7, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Kuang-Li Lee, Shu-Han Wu, Chia-Wei Lee, and Pei-Kuen Wei, "Sensitive biosensors using Fano resonance in single gold nanoslit with periodic grooves," Opt. Express 19, 24530-24539 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-24-24530


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