A fiber-optic surface plasmon resonance (SPR) sensor for temperature detection has been proposed by utilizing a thermosensitive liquid as the intermediate and combining with the fiber SPR structure. The sensing element of the sensor has been fabricated by packaging the fiber probe coated with a silver layer into a capillary filled with thermosensitive anhydrous ethanol. This packaging can protect the metal layer from oxidation and damage. Moreover, this proposed sensor achieves a sensitivity of 1.5745 nm/°C, which is much higher than that of the traditional fiber SPR sensor according to the comparative experiments.Index Terms-Capillary packaging, ethanol, fiber-optic sensors, surface plasmon resonance (SPR), temperature measurement.
In long period fiber gratings (LPFGs), the fiber modes guided by the core layer can excite surface plasmon resonance (SPR) in the metallic thin-film coated on the cylindrical surface of fibers. In this letter, the LPFG-based fiber optic SPR sensor is analyzed numerically by unconjugated form of coupled mode method. According to the mode analysis, the EH modes can couple with surface plasmon mode and are suitable for refractive index sensing application. In wavelength interrogation, the transmission dip caused by SPR is sensitive to the environmental refractive index. The sensitivity of the sensor achieves 1660 nm/RIU in the aqueous solution.Index Terms-Surface plasmon resonance, long period fiber grating, refractive index sensing, coupled mode theory.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.