Long-range surface plasmon resonance sensor based on dielectric/silver coated hollow fiber with enhanced figure of merit

Abstract

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.

High Resolution NIR TFBG-Assisted Biochemical Sensors

“…The main difference was the addition of a dielectric, forming a silica-silver-dielectric cylinder, and where the liquid of interest is placed into the hollow center of the device. The sensitivities of this configuration ranged from 2000 to 6600 nm/RIU, with figures of merit between 70 and 88 RIU -1 [53].…”

High-performance bimetallic film surface plasmon resonance sensor based on film thickness optimization

“…For example, by adding a top layer of dielectric thin film, the sensitivity of the guided-wave SPR sensor can be improved [8][9][10]. By using long-range surface plasmon, the high-resolution SPR sensors were realized [11][12][13][14]. Particularly, double-metal-layer (such as silver-gold bi-layer) can be used in a SPR sensor to enhance the sensitivity and stability [15,16].…”

High Sensitivity Refractive Index Sensor Based on the Excitation of Long-Range Surface Plasmon Polaritons in H-Shaped Optical Fiber

“…In accordance with the previous description, the operation principle of the sensor is based on the resonance of plasmonic modes excited by the fundamental core-guided mode. Clearly, the proposed structure is naturally suitable for a wavelength interrogation scheme [13,16,21,28,37,38]. Changes in the analyte RI are detected by measuring the shift of a resonance peak, λ RES , in the loss spectrum of the core-guided mode, which can be obtained from the following equation,…”

“…In recent years, many MOF-SPP sensors with different structures have been proposed to increase the sensitivity of these type of sensors, some of the alternatives are based on the selective filling of the fiber microstrusture with an analyte or with a metal nanowire [17,18]. In other alternatives, metallic layers are deposited on the inner walls of the microstructure holes then filled with analytes [19][20][21][22]. For an updated review of MOF-based SPP sensors see, e.g., [13].…”

“…Recent advances have shown other options to improve sensitivity [26,27]. Jiang et al proposed a LRSPP sensor based on a dielectric/silver-coated hollow fiber that can detect high-RI liquid filling the hollow core of the fiber with an aqueous sample [21]. However, full width at half maximum (FWHM) of the SPP resonance of this sensor is large, which leads to low detection accuracy and resolution.…”