Surface Plasmon Resonance Based Fiber Optic Sensor: Theoretical Simulation and Experimental Realization

Abstract

Surface plasmon resonance (SPR) based fiber optic sensor with two types of plasmonic metals (gold and silver) are theoretically studied and implemented experimentally. Performance characteristics like sensitivity, signal to noise ratio, the figure of merit, and resolution are evaluated for both simulated and fabricated sensor. The results of theoretical and experimental studies and also between the sensor with the gold layer and that with silver have been compared. Sensitivity is larger for the sensor with the gold layer while the signal to noise ratio and figure of merit are larger for the sensor with the silver layer for both the experimental and theoretical studies. The resolution is slightly larger for the sensor with the gold layer and there is some difference between the resolution of the simulated and that of the fabricated sensor.

Fabrication of a Chemical Sensor Based on Surface Plasmon Resonance via Plastic Optical Fiber

“…Consequently, the intensity of the light reflected off the metal film is reduced significantly, and a surface plasmon wave is formed by photon energy transfer into the metal layer [8,9]. In order to excite the surface plasmons, optical elements, such ashigh refractive index prism, optical fiber, and diffraction grating, are utilized [10]. SPR-based optical sensors are employed for different applications in life sciences, environmental safety, electrochemistry, biomedical diagnostics and chemical sciences [11].…”

Acetic acid concentration estimation using plastic optical fiber sensor based surface Plasmon resonance

“…The fiber optic based on total reflection is generally used for exciting of surface plasmon [7]. The SPR technique was used in 1982 for gas sensing for the first time, where optical excitation of Surface Plasmon Waves (SPW's) has been utilized to develop many sensors [8][9][10]. In this work, an optical fiber chemical sensor relies on SPR was designed and implemented for sensing the changes in the refractive index for the Acetic acid.…”

“…At a specific wavelength a resonance occurs and at this point a sharp dip in the transmitted power appears. Any change of the refractive index of the sensing medium, which is adjacent to the metal surface, leads to shifting in the resonance wavelength [9].…”

“…Illustration diagram of three layers system: the core of fiber, the sensitive metal layer and the medium to be analyzed[9].…”

Estimating sugar concentration in human blood serum using Surface Plasmon Resonance (SPR) –based optical fiber sensor

“…When the oscillation frequency of the metal's electrons equals the frequency of incident light the resonance takes place, so the intensity of the light reflected off the metal film reduces significantly, and a surface plasmon wave is formed by photon energy transfer into the metal layer [5][6][7][8][9]. In order to excite The surface plasmon's an optical element like high refractive index prism, optical fiber and diffraction grating are utilized [10].…”