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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 37, Iss. 18 — Sep. 15, 2012
  • pp: 3780–3782

Plasmonic nanosensor based on Fano resonance in waveguide-coupled resonators

Hua Lu, Xueming Liu, Dong Mao, and Guoxi Wang  »View Author Affiliations

Optics Letters, Vol. 37, Issue 18, pp. 3780-3782 (2012)

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We propose a plasmonic nanosensor based on Fano resonance in the strong-confinement metal–dielectric–metal waveguide side-coupled with a pair of nanoresonators. Due to the coherent interference of the splitting discrete and quasi-continuum modes, the reflection spectrum possesses a sharp asymmetric Fano resonance dip, which is dependent on the cavity–cavity phase and the refractive index change of the dielectric. The physical features contribute to a highly efficient plasmonic sensor for refractive index sensing. The nanosensor yields a sensitivity of 900nm/RIU and a figure of merit of 500, remarkable values compared with those of plasmonic sensors supported by perfect absorbers.

© 2012 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(230.4555) Optical devices : Coupled resonators
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Optical Devices

Original Manuscript: June 8, 2012
Revised Manuscript: July 31, 2012
Manuscript Accepted: August 6, 2012
Published: September 6, 2012

Hua Lu, Xueming Liu, Dong Mao, and Guoxi Wang, "Plasmonic nanosensor based on Fano resonance in waveguide-coupled resonators," Opt. Lett. 37, 3780-3782 (2012)

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