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Journal of Biomedical Optics

Nanofiber optic sensor based on the excitation of surface plasmon wave near fiber tip
Author(s): Yu-Jen Chang; Yi-Chun Chen; Hui-Ling Kuo; Pei-Kuen Wei
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Paper Abstract

We present a sensitive nano-optical fiber biosensor made by shaping a fiber to form a taper with a tip size under 100 nm. A 40-nm-thick layer of gold is coated around the tapered fiber and a surface plasmon wave is excited near the tip to achieve a sensitivity of the reflective index unit of ~4000 (% RIU–1) in the intensity measurement. A 3-D coded finite-difference time-domain approach verifies the excitation of the surface plasmon wave and the differences among its intensities in media of various refractive indices. The nanotip fiber sensor has the merits of a low background light and an ultrasmall detection region. Only a microliter of sample solution is required for detection.

Paper Details

Date Published: 1 January 2006
PDF: 5 pages
J. Biomed. Opt. 11(1) 014032 doi: 10.1117/1.2165171
Published in: Journal of Biomedical Optics Volume 11, Issue 1
Show Author Affiliations
Yu-Jen Chang, Research Ctr. for Applied Sciences (Taiwan)
Yi-Chun Chen, Research Ctr. for Applied Sciences (Taiwan)
Hui-Ling Kuo, Research Ctr. for Applied Sciences (Taiwan)
Pei-Kuen Wei, Research Ctr. for Applied Sciences (Taiwan)

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