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Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 1, Iss. 7 — Jul. 17, 2006

Resonant and non-resonant generation and focusing of surface plasmons with circular gratings

Jennifer M. Steele, Zhaowei Liu, Yuan Wang, and Xiang Zhang  »View Author Affiliations

Optics Express, Vol. 14, Issue 12, pp. 5664-5670 (2006)

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We report the generation and focusing of surface plasmon polariton (SPP) waves from normally incident light on a planar circular grating milled into a silver film. The focusing mechanism is explained by using a simple coherent interference model of SPP generation on the circular grating by the incident field. Experimental results concur well with theoretical predictions and highlight the requirement for the phase matching of SPP sources in the grating to achieve the maximum enhancement of the SPP wave at the focal point. NSOM measurements show that the plasmonic lens achieves more than a 10-fold intensity enhancement over the intensity of a single ring of the in-plane field components at the focus when the grating design is tuned to the SPP wavelength. We discuss the technique’s adaptability for surface enhanced nano-scale spectroscopy.

© 2006 Optical Society of America

OCIS Codes
(240.0240) Optics at surfaces : Optics at surfaces
(240.6680) Optics at surfaces : Surface plasmons
(350.7420) Other areas of optics : Waves

ToC Category:
Optics at Surfaces

Original Manuscript: April 25, 2006
Revised Manuscript: May 24, 2006
Manuscript Accepted: May 25, 2006
Published: June 12, 2006

Virtual Issues
Vol. 1, Iss. 7 Virtual Journal for Biomedical Optics

Jennifer M. Steele, Zhaowei Liu, Yuan Wang, and Xiang Zhang, "Resonant and non-resonant generation and focusing of surface plasmons with circular gratings," Opt. Express 14, 5664-5670 (2006)

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