Abstract
By combining a polymer-clad optic fiber and a vitreous-clad optic fiber, we proposed and fabricated a novel optic fiber surface plasmon resonance (SPR) sensor to conduct two-channel sensing at the same detection area. The traditional optic fiber SPR sensor has many disadvantages; for example, removing the cladding requires corrosion, operating it is dangerous, adjusting the dynamic response range is hard, and producing different resonance wavelengths in the sensing area to realize a multi-channel measurement is difficult. Therefore, in this paper, we skillfully used bare fiber grinding technology and reverse symmetry welding technology to remove the cladding in a multi-mode fiber and expose the evanescent field. On the basis of investigating the effect of the grinding angle on the dynamic range change of the SPR resonance valley wavelength and sensitivity, we combined polymer-clad fiber and vitreous-clad fiber by a smart design structure to realize at a single point a two-channel measurement fiber SPR sensor. In this paper, we obtained a beautiful spectral curve from a multi-mode fiber two-channel SPR sensor. In the detection range of the refractive rate between 1.333 RIU and 1.385 RIU, the resonance valley wavelength of channel Ⅰ shifted from 622 nm to 724 nm with a mean average sensitivity of 1961 nm/RIU and the resonance valley wavelength of channel Ⅱ shifted from 741 nm to 976 nm with a mean average sensitivity of 4519 nm/RIU.
Highlights
Surface plasmon resonance (SPR) technology is widely used for analyzing biological materials and for environment monitoring [1,2,3,4]
When light reflection occurs on the surface of the prism, an evanescent field escapes into the gold film and the SRP phenomenon appears
We have proposed a novel dual-channel fiber SPR sensor that combines the applications of polymer- and vitreous-clad fibers by micromachining a multi-mode fiber
Summary
Surface plasmon resonance (SPR) technology is widely used for analyzing biological materials and for environment monitoring [1,2,3,4]. Wei Peng et al [7] designed a multi-channel SPR fiber sensor that can detect two independent SPR signals on two sides of the same probe Another method is to coat gold film and silver film at different positions on the same fiber and thereby manufacture two surface plasmon sensors. The existing problems include difficulty injecting a wide-spectrum light source into a single-mode fiber having a small fiber core, the high risk of metal films on the small fiber core being damaged by the large power intensity of the propagating light, and difficulty in spreading its use due to the high cost of the special fiber To solve these problems, we have proposed a novel dual-channel fiber SPR sensor that combines the applications of polymer- and vitreous-clad fibers by micromachining a multi-mode fiber.
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