Sensitivity of Optical Fiber Sensor Based on Surface Plasmon Resonance: Modeling and Experiments

Abstract

In this paper, surface plasmon resonance curves of an optical fiber-based sensor were investigated. From an experimental and theoretical perspective, the response curves were analyzed and discussed. Precisely, such curves were calculated by modeling the analyte/metallic layer interface using a multilayer system, including the effects of roughness. Then, the experimental response curves observed in solutions with different refractive indices were compared to the simulated curves. Good agreement was obtained with respect to the resonance peak location and the shape of the curves. Consequently, these results enabled us to predict the ideal functioning conditions of the sensor, i.e., the working parameters corresponding to the best sensitivities of detection.

Refractive Index Sensing through Surface Plasmon Resonance in Light-Diffusing Fibers

“…As regards to the distribution of power among the various modes, the typical assumption about multimode fibers is a Lambertian source, which is actually the most accurate when the fiber is illuminated through a lens with a numerical aperture (NA) larger than that of the fiber. Under this assumption, the power distribution can be expressed as [17][18][19]:…”

Comprehensive study of an optical fiber plasmonic microsensor in a microfluidic device

“…From SPR effect, the hybridization of target molecules on the surface induces a variation of the optical transmission in the optical fiber [5,6,7,8]. As a result of this hybridization, a gradient of concentration of the target molecules is created in an area near the surface of the fiber, known as "concentration boundary layer" (figure 3).…”

“…is connected on the output of the fiber in order to measure the light transmission through the fiber [6]. In this way, the response of the sensor versus to the wavelength of the input light (550 to 1100 nm) can be recorded as a function of the hybridization of the analyte on the surface.…”

Sensing structure based on surface plasmonic resonance in single mode optical fibers chemically etched

“…It was used the transfer matrix formalism on a system with five layers, core / cladding / metal / dielectric / analyte [8]. This formalism is used to compute the propagation of the radiation through the layer system using the Maxwell's equations subjected to boundary conditions between two adjacent layers.…”