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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 8 — Apr. 22, 2013
  • pp: 10251–10258

Tailoring the coupling between localized and propagating surface plasmons: realizing Fano-like interference and high-performance sensor

Wenzhen Ren, Yanmeng Dai, Hongbing Cai, Huaiyi Ding, Nan Pan, and Xiaoping Wang  »View Author Affiliations


Optics Express, Vol. 21, Issue 8, pp. 10251-10258 (2013)
http://dx.doi.org/10.1364/OE.21.010251


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Abstract

Surface plasmon modes originated from various metallic nanostructures possess unique features of strong nanoscale light confinement and enhancement with tunable energy, which make them attractive and promising for a variety of applications such as sensing, solar cell, and lasing. Here, we have investigated the interaction between localized and propagating surface plasmons in a structure consisting of a gold nanobar array and a thick gold film, separated by a silica dielectric spacer layer. It is found that the reflection spectrum of the designed plasmonic structure can be readily tailored by changing the gold nanobar size, array period and the spacer layer thickness. Moreover, the strong coupling between the localized and propagating modes can result in an anticrossing behavior and even induce a Fano-like asymmetric lineshape. Importantly, the sensitivity and the figure of merit (FoM) of this plasmonic system can reach as high as 936 nm/RIU and 112, respectively. Our study offers a new, simple, efficient and controllable way to design the plasmonic systems with desired modes coupling and spectral lineshapes for different applications.

© 2013 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(260.5740) Physical optics : Resonance
(160.3918) Materials : Metamaterials

ToC Category:
Optics at Surfaces

History
Original Manuscript: January 28, 2013
Revised Manuscript: February 27, 2013
Manuscript Accepted: April 7, 2013
Published: April 18, 2013

Citation
Wenzhen Ren, Yanmeng Dai, Hongbing Cai, Huaiyi Ding, Nan Pan, and Xiaoping Wang, "Tailoring the coupling between localized and propagating surface plasmons: realizing Fano-like interference and high-performance sensor," Opt. Express 21, 10251-10258 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-8-10251


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