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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 5 — Mar. 1, 2014
  • pp: 1302–1305

Huge local electric field enhancement in hybrid plasmonic arrays

Fei Zhou, Ye Liu, and Weiping Cai  »View Author Affiliations


Optics Letters, Vol. 39, Issue 5, pp. 1302-1305 (2014)
http://dx.doi.org/10.1364/OL.39.001302


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Abstract

In this Letter, a novel hybrid nanoparticle array with huge local electric field intensity enhancement is proposed theoretically. The hybrid array is constructed by replacing some nanodisks with nanobowties from a perfect nanodisk square array. In our structure, the nanodisk array, which acts as a two-dimensional grating, can efficiently excite surface plasmon polaritons (SPPs) modes, whose electric field is much larger than the incident light. Then the SPPs mode excites the localized surface plasmon resonance (LSPR) mode of the nanobowties. When the resonant peaks of the array and the nanobowties coincide, the nanobowties are strongly excited, and the maximum intensity enhancement factor (E/E0)2 as large as 4.2×106 is achieved. A two-step excitation model is proposed to help us to understand the underlying physical mechanism for this enhancement. This hybrid array structure shows great potential in highly sensitive surface enhanced Raman scattering and fluorescence detection.

© 2014 Optical Society of America

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

History
Original Manuscript: October 17, 2013
Revised Manuscript: January 23, 2014
Manuscript Accepted: January 24, 2014
Published: February 27, 2014

Citation
Fei Zhou, Ye Liu, and Weiping Cai, "Huge local electric field enhancement in hybrid plasmonic arrays," Opt. Lett. 39, 1302-1305 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-5-1302

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