Abstract
A novel design of surface plasmon resonance (SPR) sensor is reported which leads to a highly miniaturized optical fiber sensing element with high sensitivity. A surface plasmon wave is excited on a thin metal film on a side-polished single-mode optical fiber and variations in the refractive index of analyte are detected by measuring changes in the intensity of the light back-reflected from a mirrored end face of the fiber. The operation range of the sensor is tuned toward aqueous media by using a thin tantalum pentoxide overlayer. It is demonstrated that the sensor is capable of detecting changes in the refractive index below 4×10 −5.
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