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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 6 — Jun. 1, 2013
  • pp: 1420–1425

Quasi-dark modes in a five-bar plasmonic oligomer

Tianran Liu, Yang Shen, Qiangzhong Zhu, Zhangkai Zhou, and Chongjun Jin  »View Author Affiliations


JOSA B, Vol. 30, Issue 6, pp. 1420-1425 (2013)
http://dx.doi.org/10.1364/JOSAB.30.001420


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Abstract

We introduce a plasmonic oligomer that supports two quasi-dark modes. A double plasmon-induced transparency spectrum arises from the Fano interference between a bright mode and two quasi-dark modes. A coupling Lorentzian oscillator model is employed to explain the resulting line shape. It is found that the modulation depths and frequency of two Fano resonances can be tuned effectively by displacement of each component of the oligomer. The oligomer can be used as a sensitive plasmon ruler based on both frequency shift and radiance sensing. Furthermore, an artificial magnetic quadrupole is also introduced by one of the quasi-dark modes. We expect that the oligomer will be valuable for the design of plasmonic circuits and multiwavelength surface-enhanced Raman scattering.

© 2013 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(160.4236) Materials : Nanomaterials
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optoelectronics

History
Original Manuscript: January 30, 2013
Revised Manuscript: April 4, 2013
Manuscript Accepted: April 4, 2013
Published: May 6, 2013

Citation
Tianran Liu, Yang Shen, Qiangzhong Zhu, Zhangkai Zhou, and Chongjun Jin, "Quasi-dark modes in a five-bar plasmonic oligomer," J. Opt. Soc. Am. B 30, 1420-1425 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-6-1420

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