24 April 1996 Broadband single-mode optical fiber surface plasma wave chemical sensor
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Abstract
We describe a new design of optical fiber surface plasma wave chemical sensor. The sensor consists of a tapered single mode optical fiber with a thin layer of silver evaporated on to the tapered section. The gradually changing diameter of the fiber along the taper results in a distributed coupling between the guided mode of the fiber and the surface plasma wave. As a result, and in contrast to conventional plasma wave sensors, coupling to the surface plasma wave occurs over a broad spectral range, typically several hundred nm. The device shows good sensitivity to changes in the refractive index of the external environment, with refractive index changes of 10-4 being detectable. The device is compact, simple to make, and has applications as a biochemical or immunosensor.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrew J.C. Tubb, Andrew J.C. Tubb, Frank P. Payne, Frank P. Payne, Roger Millington, Roger Millington, C. R. Lowe, C. R. Lowe, "Broadband single-mode optical fiber surface plasma wave chemical sensor", Proc. SPIE 2676, Biomedical Sensing, Imaging, and Tracking Technologies I, (24 April 1996); doi: 10.1117/12.238797; https://doi.org/10.1117/12.238797
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