Abstract
We describe a fiber optic interferometric refractive index sensor to illustrate that, by using the evanescent field of an optical waveguide, a potentially very sensitive determination of changes in the refractive index on the waveguide surface can be obtained. These changes can, e.g., be the result of immunoreactions. We used a Mach-Zehnder interferometer configuration with a flow-through cuvette in one arm with a decladded multimode glass fiber of 0.6-mm diameter and 2-cm interaction length. The obtained resolution in measuring refractive index changes is 1 × 10−3. We also developed the theory describing the sensitivity of this sensor using the modal and the geometrical ray description.
© 1991 Optical Society of America
Full Article | PDF ArticleMore Like This
András Székács, Nóra Adányi, Inna Székács, Krisztina Majer-Baranyi, and István Szendrő
Appl. Opt. 48(4) B151-B158 (2009)
Meike Hofmann, Yanfen Xiao, Stanislav Sherman, Uwe Gleissner, Thomas Schmidt, and Hans Zappe
Appl. Opt. 55(5) 1124-1131 (2016)
Thomas H. Barnes, Kenji Matsumoto, Tomoaki Eiju, Kyofumi Matsuda, and Noatake Ooyama
Appl. Opt. 30(7) 745-751 (1991)