Electromagnetic enhancement by a single nano-groove in metallic substrate
JOSA A, Vol. 27, Issue 7, pp. 1555-1560 (2010)
http://dx.doi.org/10.1364/JOSAA.27.001555
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Abstract
We propose systematic investigations of the electromagnetic enhancement by a single nano-groove in gold substrate. The impacts of the groove parameters and of the illumination conditions on the enhanced intensity are explored using a fully vectorial numerical method. The obtained data can be well predicted and explained by a simple Fabry–Perot model. By virtue of the semi-analytical model, we identify two main factors that enable giant electric-field enhancement in very narrow grooves: the Fabry–Perot resonance and the large wave impedance of the fundamental mode in the groove.
© 2010 Optical Society of America
OCIS Codes
(260.2110) Physical optics : Electromagnetic optics
(260.3910) Physical optics : Metal optics
(050.6624) Diffraction and gratings : Subwavelength structures
(240.6695) Optics at surfaces : Surface-enhanced Raman scattering
ToC Category:
Diffraction and Gratings
History
Original Manuscript: January 29, 2010
Revised Manuscript: May 12, 2010
Manuscript Accepted: May 12, 2010
Published: June 3, 2010
Citation
Siwen Zhang, Haitao Liu, and Guoguang Mu, "Electromagnetic enhancement by a single nano-groove in metallic substrate," J. Opt. Soc. Am. A 27, 1555-1560 (2010)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-27-7-1555
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