ABSTRACT
This chapter stipulates the fundamental knowledge related to the recent advances in plasmonic sensing devices. Plasmonics refers to the creation, recognition, and management of light at optical frequencies along with metal-dielectric interfaces on a nanometer scale. The chapter discusses Kretschmann (KR) configuration, optical fiber plasmonic sensors, and integrated plasmonic sensors based on metal-insulator-metal waveguides. Due to advancements in surface plasmon resonance (SPR) technology, it has also been utilized in optoelectronic devices such as SPR imaging, filters, and modulators. SPR sensors established on optical fibers function based on the directed evanescent field. Most of the EM field propagates through the optical fiber’s core, but a tiny amount of it spreads from the cladding as an evanescent field, which interacts with the plasmonic metal surface and stimulates the free electrons. Traditional SPR sensing devices established on prism-coupling are divided into two types: KR and Otto setups.
