Research Papers

Nanofiber optic sensor based on the excitation of surface plasmon wave near fiber tip

[+] Author Affiliations
Yu-Jen Chang, Yi-Chun Chen, Hui-Ling Kuo, Pei-Kuen Wei

Academia Sinica, Research Center for Applied Sciences, 128, section 2, Academia Road, Nankang, Taipei 11529, Taiwan

J. Biomed. Opt. 11(1), 014032 (January 24, 2006). doi:10.1117/1.2165171
History: Received April 21, 2005; Revised August 10, 2005; Accepted September 30, 2005; Published January 24, 2006
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We present a sensitive nano-optical fiber biosensor made by shaping a fiber to form a taper with a tip size under 100nm. 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 (% RIU1) 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.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Citation

Yu-Jen Chang ; Yi-Chun Chen ; Hui-Ling Kuo and Pei-Kuen Wei
"Nanofiber optic sensor based on the excitation of surface plasmon wave near fiber tip", J. Biomed. Opt. 11(1), 014032 (January 24, 2006). ; http://dx.doi.org/10.1117/1.2165171


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