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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 5, Iss. 14 — Nov. 16, 2010

The observation of super-long range surface plasmon polaritons modes and its application as sensory devices

X. -L. Zhang, J. -F. Song, G. Q. Lo, and D. -L. Kwong  »View Author Affiliations


Optics Express, Vol. 18, Issue 21, pp. 22462-22470 (2010)
http://dx.doi.org/10.1364/OE.18.022462


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Abstract

In this communication, we will describe one unique phenomenon and the potential application of it. In this work, the dispersion relation of an air-silver-silicon-silver-fluid (air-Ag-Si-Ag-fluid) five-layer slab is analyzed theoretically, in which the super-long range surface plasmon polaritons (SPP) modes, whose energy penetrates deeply into the fluid, are found with their losses being extremely small and sensitive to the change of the fluid refractive index when operating near their interspace cut-off regions, where the dispersion curves are non-continuous. By applying this phenomenon in detecting the fluid refractive index change, a SPP sensor based on intensity measurement is proposed. It is a waveguide structure with an Ag-Si-Ag slab together with a flow cell filled with the detecting fluid. It is found that a large scale of linear detection (e.g., 0.08, for 1550 nm ~1.33 to 1.41) with high resolution (e.g., 7.9 × 10−6 Refractive Index Units) can be achieved for a very short device, which is 200 μm.

© 2010 OSA

OCIS Codes
(130.6010) Integrated optics : Sensors
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

History
Original Manuscript: July 29, 2010
Revised Manuscript: September 7, 2010
Manuscript Accepted: September 8, 2010
Published: October 8, 2010

Virtual Issues
Vol. 5, Iss. 14 Virtual Journal for Biomedical Optics

Citation
X. -L. Zhang, J. -F. Song, G. Q. Lo, and D. -L. Kwong, "The observation of super-long range surface plasmon polaritons modes and its application as sensory devices," Opt. Express 18, 22462-22470 (2010)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-18-21-22462


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