Multi-parameter sensing based on surface plasma resonance with tungsten disulfide sheets coated

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: Combining With Intermode Interferencementioning

confidence: 99%

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

Han

Laser & Photonics Reviews

et al. 2022

“…The fiber-optic sensors have been extensively used in many different fields as well as in harsh environments due to their small size, lightweight, cost-effective, excellent corrosion and electromagnetic resistance [1]. A variety of physical parameters like refractive index [2], temperature [3], curvature [4], pressure [5], and concentration [6], etc.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity enhanced interferometric optical sensor of taper-in-taper structure for heavy metal ions detection

International Conference on Optoelectronic Materials and Devices (ICOMD 2022)

Lei²,

Liu³

et al. 2023

Heavy metal pollution in water resource is a serious issue that related to the ecosystem and the health status of human beings. Although there existed many detection methods, it is still difficult to create a device with ultrahigh sensitivity to detect heavy metal ions in situations with low concentrations. This paper proposed a taper-in-taper (T-I-T) interferometric fiber sensor of enhanced sensitivity and decorated with polyelectrolyte layers for Cu2+ detection. The T-I-T structure was created on the single-mode fiber via twice arc discharges. The maximum refractive index (RI) sensitivity of T-I-T fiber sensor is as high as 4170 nm/RIU, meanwhile, when apply in heavy metal ions detection, the sensitivity can reach 10.4 nm/ mM when the Cu2+ concentration is 0.1-1 mM. Furthermore, there is a low temperature cross sensitivity of only 0.12 nm/°C. The proposed T-I-T fiber sensor has the potential to be applied in water resource environmental monitoring due to its benefits of high sensitivity, compact structure, and excellent stability.

“…The silica-based fibers combined with the other materials, including liquids [ 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ], nanoparticles [ 13 , 14 ], and 2D materials (graphene) [ 15 , 16 , 17 , 18 , 19 ], would generate much higher sensitivity to external parameters than that of the intrinsic silica fibers. Various configurations for the FMZIs have been proposed in the literature and have been demonstrated their effectiveness [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. Examples include an FMZI with anti-resonance based on an multi-mode fiber (MMF)-HCF-MMF structure for sensing application [ 21 ], tapered fiber-based FMZI for the refractive index (RI) and temperature (T) measurement [ 22 ], core-offset in-line FMZI [ 23 ], an in-line FMZI with thin-core fiber (TCF)-thin fiber-TCF [ 24 ], and SMF-HCF-SMF structures [ 12 , 20 , 28 , <...>…”

Section: Introductionmentioning

confidence: 99%

“…In 2017, an FMZI structure based on the HCF coated inner zinc oxide film was developed to improve the output optical spectrum [ 29 ]. Another FMZI sensor with a tungsten disulfide-coated surface was intended for measuring ethanol vapor concentration [ 25 ], high TOC and large elasticity PDMS sealed a micro-FMZI for the simultaneous measurement of pressure and T [ 26 ], and a single core-offset FMZI coated with polyvinyl alcohol was designed for the simultaneous measurement of relative humidity and T [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Modulated In-Fiber Mach–Zehnder Interferometer Based on an Ultracompact Leaky-Guided Liquid Core

Lee

Zhuo

Liu

2022

Sensors

We proposed a novel sensor based on an ultracompact leaky-guided liquid core fiber Mach–Zehnder interferometer (LLCFMZI) for high modulation of an interference spectrum. The sensor structure is based on a micro-sized hollow-core fiber (HCF) splicing a tilt end face single-mode fiber (SMF) to create a miniature oblique gap for the effective access of different liquids. The liquid core with a relatively lower refractive index (RI) than the cladding can achieve a leaky-mode optical waveguide (LMOW) mechanism, and its volume is only approximately 7.85 pL. In addition, the utilized micro-length HCF can reduce the energy loss of core in the LMOW to obtain an acceptable extinction ratio (>30 dB) with high temperature (T) sensitivity in the interference spectra. Experimental results show that the interference spectra can be highly modulated within the wide measurement range of 1250–1650 nm with a steadily linear response for thermal effect. The measured temperature sensitivities (T-sensitivities) of various liquids of DI water, ethanol, and Cargille-liquid (nD = 1.305) are 0.8869, 4.4754, and 4.8229 nm/°C, and the corresponding measured thermal optics coefficient (TOC) are −4.16 × 10−5, −2.11 × 10−4, and −3.6 × 10−4 °C−1, respectively. Measurement results demonstrate that the used liquids with a higher TOC can obtain better T-sensitivity modulation. The highest experimental sensitivity of the liquid-core filled with Cargille-liquid (nD = 1.40) is up to +13.87 nm/°C with a corresponding TOC of −4.07 × 10−4 °C−1. Furthermore, the experimental and theoretical values are in good agreement according to FSR the measuring scheme that investigates the effectiveness of the proposed LLCFMZI.