Compact distributed fiber SPR sensor based on TDM and WDM technology

Han

Laser & Photonics Reviews

et al. 2022

Fiber optic sensors based on surface plasmon resonance (SPR) have demonstrated outstanding performance in biomedical, environmental monitoring, public safety, and other aspects, which provide powerful platforms for qualitative detection and quantitative analysis of molecular interactions. Among them, multichannel fiber optic SPR sensor has become a core tool in parallel detection scenarios due to the superiorities of compensating for nonspecific binding and environmental fluctuations and implementing multianalyte determination. The realization methods of multichannel sensing revolve around fiber microstructures, enhancement by materials, and hybrid fiber. The applications of multichannel fiber optic SPR sensors are demonstrated in sensing of liquid refractive index (RI), RI and temperature, biochemical molecules, and physical parameters. This review thoroughly analyzes and compares the structure, excitation effect, sensing performance, and the advantages and disadvantages of each type of multichannel fiber optic SPR sensor. Even though there are still some challenges, such as insufficient sensing channels and difficulty in fabrication, in their advancement, efforts in multidiscipline including developing high-performance sensitive films and innovating micro-nano fabrication processes will overcome these bottlenecks. Lastly, the future development directions of multichannel fiber optic SPR sensors from principle, structure, and material aspects are discussed.

Section: Multichannel Sensing Of Liquid Rimentioning

confidence: 99%

Section: Multichannel Sensing Of Liquid Rimentioning

confidence: 99%

Section: Application Status Of Mc‐spr Sensorsmentioning

confidence: 99%

See 1 more Smart Citation

Multichannel Fiber Optic SPR Sensors: Realization Methods, Application Status, and Future Prospects

Han

Laser & Photonics Reviews

et al. 2022

“…Since Jorgenson and Yee proposed fiber-optic SPR sensor decades ago, many new types of fiber-optic SPR sensor have been increasingly developed possessing the advantages of small size, allows for a smaller sample volume, easy to be integrated [ 2 , 3 ]. Typically, flat metal layers are used in bulk optical Kretschmann configuration where polarizing devices are used to provide TM-polarized incident light with respect to the incident plane without ambiguity.…”

Section: Introductionmentioning

confidence: 99%

A Polarization-Independent Fiber-Optic SPR Sensor

Gao

Zou

et al. 2018

Sensors

Self Cite

Fiber-optic surface plasmon resonance (SPR) sensors possess the advantages of small size, flexible, allowing for a smaller sample volume, easy to be integrated, and high sensitivity. They have been intensively developed in recent decades. However, the polarizing nature of the surface plasmon waves (SPWs) always hinders the acquisition of SPR spectrum with high signal-noise ratio in wavelength modulation unless a polarizer is employed. The addition of polarizer complicates the system and reduces the degree of compactness. In this work, we propose and demonstrate a novel, polarization-independent fiber-optic SPR sensor based on a BK7 bi-prism with two incident planes orthogonal to each other. In the bi-prism, TM-polarized components of non-polarized incident lights excite SPWs on the first sensing channel, meanwhile the TE components and the remaining TM components are reflected, then the reflected TE components serve as TM components of incident lights for the second sensing channel to excite SPWs. Simulations show the proposed SPR structure permit us to completely eliminate the polarization dependence of the plasmon excitation. Experimental results agree well with the simulations. This kind of devices can be considered an excellent option for development of simple and compact SPR chemical sensors.

“…Špačková et al [ 11 ] and Baiad et al [ 12 ] made use of optical grating to fabricate a multi-channel SPR sensor in a single fiber; however, a disadvantage of optical grating is its low sensitivity. Our team has fabricated a multi-channel fiber SPR sensor from a special single-mode fiber with a cone angle structure [ 13 , 14 , 15 ]. 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.…”

Section: Introductionmentioning

confidence: 99%

Two-Channel SPR Sensor Combined Application of Polymer- and Vitreous-Clad Optic Fibers

Wei

Liu

et al. 2017

Sensors

Self Cite

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.