Experimental realization and numerical simulation of wavelength-modulated fibre optic sensor based on surface plasmon resonance

Sensitivity enhancement for a multimode fiber sensor with an axisymmetric metal grating layer

“…On the basis of the above observations, the following conclusions can be drawn. The proposed sensor has an estimated sensitivity of 4624 nm/RIU in the RI range from 1.355 to 1.365, which is higher than that achieved 4262 nm/RIU (RI: 1.355-1.365) in [2], and an estimated sensitivity of 13000 nm/RIU in the RI range from 1.395 to 1.40, which is significantly higher than that achieved 7500 nm/RIU (RI: 1.395-1.40) in [15].The effects of the grating length, the fiber core diameter and the metal grating layer thickness on the sensitivity S are not especially significant, while the grating period has relatively larger influence on the sensitivity S. The quality factor Q of the SPR dip is strongly dependent on the grating length, the fiber core diameter, the metal grating layer thickness and the grating period.…”

“…4(b). It shows that the proposed Fiber-based SPR sensor has an estimated sensitivity of 13000 nm/RIU in the RI range from 1.395 to 1.40 which is much higher than that of 7500 nm/RIU reported in [15] and 3892 nm/RIU in the RI range from 1.333 to 1.353 which is comparable to that of 4262 nm/RIU achieved in [2]. In order to better understand the transmission properties of the Fiber-based SPR sensor, the spectral response of the structure with various characteristic parameters is studied.…”

“…Recently, several fiber based SPR sensors have been presented such as a multimode fiber coated with bimetallic layers (silver and gold, with gold as the outer layer), a hetero-core fiber with Au/Ta 2 O 5 /Pd multi-layers, and a multimode fiber covered with a nano-particle metal film, which were both studied theoretically based on the attenuated total reflection (ATR) method and multi-layer model [12][13][14][15]. Among these studies, the effects of the parameters and characteristics of the optical fiber and metal layer on the sensor sensitivity have been investigated in detail, for example recently the relationships between the resonance wavelength and the thickness of the metal layer and sensing layer were investigated [16].…”

A Gold-Deposited Surface Plasmon Resonance-based Optical Fiber Sensor System Using Various Light-Emitting Diodes

“…[1][2][3] Gold (Au) and silver (Ag) are the most widely used metals for the sensor elements and the sensor properties depend on the dielectric constant (εr + εii) of the deposited metal. [4][5][6][7] Sensor systems which scan the wavelength [8][9][10][11][12][13][14][15][16][17] or change the angle of incident light [18][19][20][21][22][23][24][25][26][27][28] have been proposed. Though other types of sensor system based on SPR do not require a change in the incident angle, they do need many optical parts for their construction.…”

Sensor Properties and Surface Characterization of Silver-deposited SPR Optical Fibers

“…[1][2][3] Sensor systems which scan the wavelength [8][9][10][11][12][13][14][15][16][17] or change the angle of incident light [18][19][20][21][22][23][24][25][26][27][28] have been proposed. Though another type of sensor system based on SPR does not need a change in the incident angle, it needs many optical parts for its construction.…”