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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 31, Iss. 6 — Jun. 1, 2014
  • pp: 1194–1199

Role of hybrid wave in electromagnetic enhancement by a metallic groove doublet

Siwen Zhang, Haitao Liu, and Xiaodong Sun  »View Author Affiliations


JOSA A, Vol. 31, Issue 6, pp. 1194-1199 (2014)
http://dx.doi.org/10.1364/JOSAA.31.001194


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Abstract

We provide an elaborate investigation on the role of a hybrid wave (HW) in electromagnetic enhancement by a groove doublet in metallic substrate. A simple HW model is built to explore the detailed effect of HW on electromagnetic enhancement. The effective range of electromagnetic enhancement is obtained within 0.1λ away from a metal surface. The excitation of HW by a single groove has a gentle growth (from 0.03 to 0.26) as the groove gets wide, which implies that the emerging field of HW launched by a single groove is quite weak for narrow ones. HW, being like an “energy porter,” takes away partial energy from the Fabry–Perot resonance, which will be further coupled into the fundamental mode in the other groove after traveling along the metal surface. Our analysis reveals a compensation of electromagnetic enhancement for wide grooves attributed to the appearance of HW. The dependence of HW and electromagnetic enhancement on the noble metal type is also discussed.

© 2014 Optical Society of America

OCIS Codes
(240.6690) Optics at surfaces : Surface waves
(260.3910) Physical optics : Metal optics
(050.6624) Diffraction and gratings : Subwavelength structures
(240.6695) Optics at surfaces : Surface-enhanced Raman scattering

ToC Category:
Optics at Surfaces

History
Original Manuscript: January 21, 2014
Revised Manuscript: April 2, 2014
Manuscript Accepted: April 7, 2014
Published: May 12, 2014

Citation
Siwen Zhang, Haitao Liu, and Xiaodong Sun, "Role of hybrid wave in electromagnetic enhancement by a metallic groove doublet," J. Opt. Soc. Am. A 31, 1194-1199 (2014)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-31-6-1194

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