Long-range surface plasmon resonance sensor based on dielectric/silver coated hollow fiber with enhanced figure of merit.
A long-range surface plasmon resonance (LRSPR) sensor based on dielectric/silver-coated hollow fiber (HF) is proposed. It can detect the refractive index (RI) of sensed liquid filled in the hollow core of the sensor. A HF LRSPR sensor with 90-nm-thick silver layer and 260-nm-thick OC300 layer is fabricated. Experiments are taken to evaluate the performance of the sensor by measuring the transmission spectra. Theoretical analysis based on a ray model is also taken, and the results agree well with the experimental results. The proposed sensor has similar sensitivity but much smaller SPR dip width than the silver-coated HF SPR sensor. Thus figure of merit of the sensor is enhanced approximately five times. The stability of the sensor is also improved because the dielectric layer acts as a protection layer for the damageable silver layer.
Yong-Xiang
YX
Jiang
Bing-Hong
BH
Liu
Xiao-Song
XS
Zhu
Xiao-Li
XL
Tang
Yi-Wei
YW
Shi
D017097:Electric Impedance; D055100:Optical Fibers; D012834:Silver; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
D012834:Silver