The distinctive optical properties of surface plasmons have led to a number of significant applications in chemistry, biology, materials, renewable energy, and information and technology sciences. In recent years, the rapid growth of plasmonic sensors, which are based on the ultra-sensitivity of surface plasmon resonance to the surrounding medium and the amplifying of local electromagnetic fields, has occurred. The most important sensing techniques are surface-enhanced spectroscopic sensors like surface-enhanced Raman scattering, surface-enhanced fluorescence, and surface-enhanced infrared absorption, as well as SPR sensors, which have already led to the creation of several industrial companies.
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