Bent-fiber intermodal interference based dual-channel fiber optic refractometer

Zhang, Xinpu; Peng, Wei

doi:10.1364/oe.23.007602

Cited by 49 publications

(16 citation statements)

References 34 publications

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“…Thus far, a substantial number of fiber-optic designs for RI sensing have been presented. These include tapered multimode fiber (MMF) tips [3,4]; bent fibers incorporating a plastic MMF with a large numerical aperture (NA) [5], standard single-mode fibers (SMFs) with a reduced cladding diameter [6], and dual-channel SMF bending [7]; fiber Bragg gratings (FBGs), including long-period gratings, surface FBGs, macro-bent FBGs, and tilted moiré FBGs [8,9,10,11]; side-polished or D-shaped fibers [12,13,14,15]; waist-deformed fiber tapers fabricated by heat or chemical tapering [16,17,18]; heterostructures formed by the splicing of hetero-core fibers, including MMF-SMF-MMF [19], SMF-MMF-SMF [20], SMF-tapered claddingless fiber-SMF [21], SMF-hole-assisted dual-core fiber-SMF [22], and cascaded single-mode-no-core-hollow-core-no-core-single-mode structures [23].…”

Section: Introductionmentioning

confidence: 99%

Fiber Reshaping-Based Refractive Index Sensor Interrogated through Both Intensity and Wavelength Detection

Jiang

Lee

2019

Sensors

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A fiber reshaping-based refractive index (RI) sensor is proposed relying on both optical intensity variation and wavelength shift. The objective of this study is to completely reshape the core and to ultimately mimic a coreless fiber, thereby creating a highly efficient multimode interference (MMI) coupler. Thus, propagation modes are permitted to leak out into the cladding and eventually escape out of the fiber, depending on the surrounding environment. Two interrogation mechanisms based on both the intensity variation and wavelength shift are employed to investigate the performance of the RI sensor, with the assistance of leaky-mode and MMI theories. By monitoring the output intensity difference and the wavelength shift, the proposed RI sensor exhibits high average sensitivities of 185 dB/RIU and 3912 nm/RIU in a broad range from 1.339 to 1.443, respectively. The operating range and sensitivity can be adjusted by controlling the interaction length, which is appealing for a wide range of applications in industry and bioscience research.

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Section: Introductionmentioning

confidence: 99%

Fiber Reshaping-Based Refractive Index Sensor Interrogated through Both Intensity and Wavelength Detection

Jiang

Lee

2019

Sensors

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“…sensitivity of RI versus wavelength can be obtained [15]. By linear fitting, a high sensitivity of 225.95 nm/RIU is achieved which is higher than the U-bent structure [11]. Fig.…”

Section: Resultsmentioning

confidence: 95%

High Sensitivity Balloon-Like Interferometer for Refractive Index and Temperature Measurement

Liu

Zhao

et al. 2016

IEEE Photon. Technol. Lett.

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An all-fiber high-sensitivity modal interferometer formed by a bent standard single-mode fiber (SMF) has been presented and demonstrated, which can be used to measure refractive indexes (RIs) of solutions and temperature. The interferometer has a simple and compact structure built with a bent bare SMF mimicking a balloon shape. Because of the curvature of bent fiber sensor, modal interference effect would occur when light propagates from the fiber core into the cladding. The measurement is achieved by monitoring the spectral shift of the modal interference. The performances of the interferometers with different bending diameters and sensitive lengths are experimentally investigated concluding the optimal bending radius as 4 mm and sensitive length 16 mm. In the RI range of 1.3493-1.3822, the corresponding sensitivity and detection limit are 225.95 nm/RIU (refractive index unit) and 3.2×10 −4 , respectively. The temperature sensitivity and detection limit of 0.418 nm/°C and 0.173°C are achieved, respectively.Index Terms-Balloon-like interferometer, bent single-mode fiber, refractive index (RI) sensing, temperature sensing.

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“…Zhang et al [49] presented the intermodal interference of SMF bending through theoretical and experimental demonstration. After light propagates through the semicircular region of a SMF, the phase difference between the core and the m th -order cladding mode is written as Equation 1:…”

Section: Connection Between Wavelength and Refractive Indexmentioning

confidence: 99%

A Lamping U-Shaped Fiber Biosensor Detector for MicroRNA

Wen¹,

Huang²,

Li³

et al. 2020

Sensors

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This study presents a U-shaped optical fiber developed for a facile application of microRNA detection. It is fabricated by the lamping process and packaged in a quartz tube to eliminate human negligence. In addition, silanization and electrostatic self-assembly are employed to bind gold nanoparticles and miRNA-133a probe onto the silicon dioxide of the fiber surface. For Mahlavu of hepatocellular carcinoma (HCC), detection is determined by the wavelength shift and transmission loss of a U-shaped optical fiber biosensor. The spectral sensitivity of wavelength and their coefficient of determination are found at −218.319 nm/ ng/mL and 0.839, respectively. Concurrently, the sensitivity of transmission loss and their coefficient of determination are found at 162.394 dB/ ng/mL and 0.984, respectively. A method for estimating the limit of detection of Mahlavu is at 0.0133 ng/mL. The results show that the proposed U-shaped biosensor is highly specific to miRNA-133a and possesses good sensitivity to variations in specimen concentration. As such, it could be of substantial value in microRNA detection.

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Bent-fiber intermodal interference based dual-channel fiber optic refractometer

Cited by 49 publications

References 34 publications

Fiber Reshaping-Based Refractive Index Sensor Interrogated through Both Intensity and Wavelength Detection

Fiber Reshaping-Based Refractive Index Sensor Interrogated through Both Intensity and Wavelength Detection

High Sensitivity Balloon-Like Interferometer for Refractive Index and Temperature Measurement

A Lamping U-Shaped Fiber Biosensor Detector for MicroRNA

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