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Enhanced plasmonic biosensors based on microstructured optical fibers

Abstract. Plasmonic devices using microstructured optical fibers are particularly well suited for the development of high sensitivity chemical and biochemical sensors, thanks to their intrinsic microfluidic properties. We review the most recent literature on such sensors, comparing different types and approaches. Then, we present some examples of the design/analysis using finite-element software tools. In particular, a sensor for liquid analytes based on a birefringent solid-core microstructured optical fiber is discussed in detail. This device has six holes, quite a limited number in comparison to other structures with similar performances, whose geometrical characteristics can be tailored to optimize the power fractions carried by the core and plasmon modes at the loss-matching points in the analyte layer depending on the analyte refractive index.