High Sensitivity of Refractive Index Sensor Based on Analyte-Filled Photonic Crystal Fiber With Surface Plasmon Resonance

Abstract

Two kinds of novel plasmonic high-sensitivity of refractive index(RI) sensors based on analyte-filled photonic crystal fiber (AF-PCF) are proposed in this paper. The metallic gold and silver is used as the surface plasmon resonance (SPR) activity metal. A full-vector finite element method (FEM) is applied to analyze and investigate the sensing and coupling characteristics of this designed AF-PCF with the gold or silver layer. Phase matching between 2nd surface plasmon polariton (SPP) and fundamental modes can be met at different wavelengths as the analyte of RI is increased from 1.40 to 1.42. The phase matching wavelength of the designed AF-PCF with the gold layer is shifted to the longer wavelength direction compared to that with the silver layer, and the resonance strength is much stronger. The average sensitivities of 7040 nm/RIU and 7017 nm/RIU in the sensing arrange from 1.40 to 1.42 with high linearity are achieved for the designed sensors with the gold and silver layers, respectively, which are almost the same. While the figure of merit (FOM) with silver layer is much better than that with the gold layer.Index Terms: Photonic crystal fiber, Surface plasmon resonance. Refractive index sensor 1943-0655 (c)

A Large Detection-Range Plasmonic Sensor Based on An H-Shaped Photonic Crystal Fiber

“…The laborious process will make the sensor more fragile. In recent years, many researchers have focused on different types of photonic crystal fiber (PCF)-based SPR sensor [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. By introducing air holes in the core area of the PCF, the effective refractive index (n eff ) of the core mode can be reduced, thus easily realizing the phase matching between the core mode and the SPP modes [14][15][16][17][18].…”

“…By introducing air holes in the core area of the PCF, the effective refractive index (n eff ) of the core mode can be reduced, thus easily realizing the phase matching between the core mode and the SPP modes [14][15][16][17][18]. These PCF-based SPR sensors have the advantages of miniaturization, high sensitivity and multi-parameter measurement, which make them more competitive in SPR sensing applications [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. However, currently, PCF-based SPR sensors have two principal challenges: the first problem is the difficult process of the sensor's fabrication, such as metal coating and analyte filling.…”

“…However, currently, PCF-based SPR sensors have two principal challenges: the first problem is the difficult process of the sensor's fabrication, such as metal coating and analyte filling. In practice, the holes in these sensors are very small in size, generally in the order of Sensors 2020, 20, 1009 2 of 8 micrometers [8,11,[13][14][15][16][17]20,21,24]. Therefore, it is difficult to coat them with metal film uniformly and to fill them with liquid analyte within the predetermined parameters.…”

Temperature Sensor Based on Photonic Crystal Fiber Filled With Liquid and Silver Nanowires

“…Additionally, the existence of air holes provides the possibility to insert functional materials [3], which can realize the interaction of transmission light and materials effectively. Recently, a large variety of PCF based sensors are reported to measure temperature [4]- [8], strain [9], vibration [10], twist [11], refractive index (RI) [12], [13], gas absorption [14], magnetic field [15], and so on, which have been widely used in physical, chemical, and biochemical sensing applications.…”

“…SPR technique owns extraordinary properties like label free, real-time and high resolutions down to 10 À7 RI units (RIUs) [16], which is not accessible to other sensing methods. Combining the advantages of PCF and SPR, many sensing devices have been very recently reported [12], [13], [17]- [19]. Hassani et al first designed a RI sensor and realize the detectable RI change of 10 À4 [17].…”