Ultrahigh-sensitivity fiber Bragg grating refractive index sensor based on thin cladding and mode transition

Feng, Wenbin; Gu, Zhengtian

doi:10.1016/j.ijleo.2019.01.025

Cited by 6 publications

(6 citation statements)

References 17 publications

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“…The open path FPI’s sensitivity to residue is, thus, generally decreased by increasing the length of the microcell optical path involved in the sensor design. In contrast, sensors that exploit evanescent field interactions (most FBG RI sensors [ 12 , 13 , 14 ], LPFG sensors [ 15 , 16 , 17 ], modal interference sensors [ 18 , 19 , 20 ], etc.) exhibit substantially higher sensitivity to the formation of deposits and residues, as even a very thin formation of the undesired residue film on the sensor surface results in a substantial change in the average RI of the volume that is involved in the measurement of the RI.…”

Section: Sensor Designmentioning

confidence: 99%

An All-Fiber Fabry–Pérot Sensor for Emulsion Concentration Measurements

Pevec

Kunavar²,

Budinski

et al. 2023

Sensors

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This paper describes a Fabry–Pérot sensor-based measuring system for measuring fluid composition in demanding industrial applications. The design of the sensor is based on a two-parametric sensor, which enables the simultaneous measurement of temperature and refractive index (RI). The system was tested under real industrial conditions, and enables temperature-compensated online measurement of emulsion concentration with a high resolution of 0.03 Brix. The measuring system was equipped with filtering of the emulsion and automatic cleaning of the sensor, which proved to be essential for successful implementation of a fiber optic RI sensor in machining emulsion monitoring applications.

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Section: Sensor Designmentioning

confidence: 99%

An All-Fiber Fabry–Pérot Sensor for Emulsion Concentration Measurements

Pevec

Kunavar²,

Budinski

et al. 2023

Sensors

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show abstract

“…This technology could find applications in food production facilities, restaurants, and other settings where salmonella contamination is a risk, contributing to the protection of public health and the prevention of this dangerous infection. In some works, the Bragg grating sensor has been used to detect a tiny change in the refractive index [2][3][4]; however, in their work, they use infrared light, which will lead to high loss when used with a water solution, unlike the proposed sensor, where visible light has been used.…”

Section: Introductionmentioning

confidence: 99%

“…Fiber Bragg gratings (FBG) are optical devices that consist of a periodic variation in the refractive index of an optical fiber core [2]. This variation acts as a selective mirror that reflects light of a certain wavelength, known as the Bragg wavelength, and transmits the rest.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive On-Chip Grating-Based Optical Sensor on Glass Substrate: Cost-Effective Design

Attia,

Ahmed,

Elsharkawi

et al. 2024

Photonics

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This paper presents a novel on-chip optical sensing system using ion exchange technology and phase-shifted Bragg grating design. The sensor geometry has been optimized using a finite difference time domain (FDTD) solver to achieve maximum sensitivity and figure of merit (FOM). The proposed design offers high sensitivity to changes in refractive index and low fabrication costs. The ion exchange process used to create the sensor allows for precise refractive index control, optimizing the sensor’s sensitivity and FOM. A graded-index waveguide and a phase-shifted Bragg grating structure also contribute to the sensor’s high sensitivity. The proposed sensor design was tested for water-based sensing applications, achieving a FOM of 227.63 and a 343.1 nm/RIU sensitivity. These values are significantly higher than those reported for other Bragg grating sensors, highlighting the potential of the proposed design for high-performance sensing applications. The sensor’s high sensitivity and low fabrication costs make it a promising technology for future sensing and monitoring applications.

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“…In recent years, various multi-port output beam splitters have been proposed, such as even-port beam splitter [6][7][8][9], odd-port output beam splitter [10][11][12], and polarization selective beam splitter [13,14]. Among them, the three-port beam splitter has the features of simple structure and large manufacturing tolerance, so it is widely used in pulse detection [15], sensors [16][17][18][19][20][21], signal processing [22][23][24], and photonic crystal fabrication [25,26]. Therefore, it is necessary to propose an efficient three-port diffraction beam splitter.…”

Section: Introductionmentioning

confidence: 99%

Microstructural characteristics of sandwiched T-shaped metamaterials for three-port splitting

Liang¹,

Wang²

2022

Laser Phys.

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This paper presents a polarization-insensitive sandwiched three-port beam splitting grating at normal incidence. The grating adopts a sandwiched structure. Based on the rigorous coupled-wave analysis (RCWA) and the simulated annealing algorithm, the grating parameters are optimized to obtain the diffraction efficiencies of 32.83% at 0th order and 32.87% at ±1st orders for transverse electric polarization, and 32.63% at 0th order and 32.39% at ±1st orders for transverse magnetic polarization. Meanwhile, the calculation results of the finite element method are in general agreement with those of RCWA. In addition, the analysis results of grating period, duty cycle, and wavelength bandwidth further demonstrate the good wavelength bandwidth of the grating and its feasibility for practical production. Therefore, the grating can be widely used in actual production.

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Ultrahigh-sensitivity fiber Bragg grating refractive index sensor based on thin cladding and mode transition

Cited by 6 publications

References 17 publications

An All-Fiber Fabry–Pérot Sensor for Emulsion Concentration Measurements

An All-Fiber Fabry–Pérot Sensor for Emulsion Concentration Measurements

Highly Sensitive On-Chip Grating-Based Optical Sensor on Glass Substrate: Cost-Effective Design

Microstructural characteristics of sandwiched T-shaped metamaterials for three-port splitting

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