Effect of constructional parameters on the performance of a surface plasmon resonance sensor based on a multimode polymer optical fiber

Abstract

We experimentally studied the influence of different constructional parameters on the performance of surface plasmon resonance (SPR) sensors based on a commercially available polymer step-index multimode fiber. For the first time, to the best of our knowledge, we experimentally investigated the influence of polishing depth on the characteristics of SPR sensors based on a straight multimode fiber. We also examined the impact of sensing length on the spectral position and strength of the SPR in side-polished straight fibers. To clarify literature contradictions concerning the effect of fiber bending on SPR, we experimentally investigated the performance of U-bent SPR sensing probes based on multimode fibers. We have shown that the SPR can be significantly amplified by bending the polymer fiber with stripped cladding. We also demonstrated that the side-polishing of U-bent sensing probes has little impact on their performance.

Plasmonic Fiber Optic Refractometric Sensors: From Conventional Architectures to Recent Design Trends

“…Feasibility of bent MOF SPR sensors have also been theoretically investigated for potential performance improvement, tunable by bending [ 63 ]. However, a recent experimental study, comparing bent and straight side-polished SPR probes revealed no significant improvement for the bent SPR fiber (bent radii of 10, 15 and 20 mm) compared with a straight side-polished one [ 64 ].…”

D-shape polymer optical fibres for surface plasmon resonance sensing

“…Consequently, the bending induced deformation of the external layer of the cladding, which scales up with the fibre diameter, is a few times lower in the fibres reported in this work compared to Ref. 28, thus giving a practically null impact on the sensors sensitivity.…”

“…In our previous work [28], a small dependence of the sensitivity upon a bending radius was reported. This discrepancy is related to a greater diame− ter of the fibre used for fabrication of the sensors reported in Ref.…”

“…This discrepancy is related to a greater diame− ter of the fibre used for fabrication of the sensors reported in Ref. 28, which was equal to 980 μm. Consequently, the bending induced deformation of the external layer of the cladding, which scales up with the fibre diameter, is a few times lower in the fibres reported in this work compared to Ref.…”

Carbon nanomaterials incorporated specialty optical fibers for environmental sensing applications

“…Variations in RI of the ambient environment would affect the wavelength at which this plasmon absorption occurs resulting in a variation in resonant wavelength of the absorption bands [139]. Such SPR sensing probes have been mainly used as RI sensors and have been demonstrated using etched fibers [138,140], side polished fibers [139,141,142] and also through the deposition of gold nanoparticles onto the end-face of an optical fiber [143].…”