Second-HArmonic Plasmon-Enhanced Sensing
In the last decade, many efforts have been dedicated to conceive and develop high-sensitivity devices able to detect small amounts of matter and to monitor chemical reactions down to the single molecule level. In this framework, sensors exploiting propagating surface plasmons rapidly found their way to the market given their reliability and simple implementation in optical diagnosis systems. Pharmacology, metrology and medicine are certainly among the areas where such devices are already showing their huge potential. These sensors, based on metallic films, can detect small amounts of analyte by the variations it produces in the local refractive index, which in turn cause shifts in the plasmon resonance. The project is focused on a recent development of this sensing technique that concerns the use of metal nanostructures wherein the resonance frequency and linewidth, which determine the device sensitivity, can be tuned by engineering the nanostructure size and geometry.
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