Titanium Dioxide Film Coated Excessively Tilted Fiber Grating for Ultra-Sensitive Refractive Index Sensor

Li, Zhihong; Luo, Qian-Qian; Yan, Boteng; Ruan, Xiukai; Zhang, Yaoju; Dai, Yuxing; Cai, Zhennao; Chen, Tao

doi:10.1109/jlt.2018.2873159

Cited by 10 publications

(1 citation statement)

References 45 publications

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“…Titanium dioxide (TiO 2 ) is widely used in the optical and biological fields due to its high refractive index, non-toxicity and high biocompatibility. Sensors made of fiber grating sputtered with TiO 2 have been widely used in refractive index measurements [ 16 , 17 ]. In order to obtain higher sensitivity, thermosensitive materials with a high thermoluminescence coefficient and thermal expansion coefficient have attracted increasing attention from researchers.…”

Section: Introductionmentioning

confidence: 99%

High Sensitivity Temperature Sensing of Long-Period Fiber Grating for the Ocean

Zhang

Shi

et al. 2023

Sensors

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In this study, a new temperature sensor with high sensitivity was achieved by four-layer Ge and B co-doped long-period fiber grating (LPFG) based on the mode coupling principle. By analyzing the mode conversion, the influence of the surrounding refractive index (SRI), the thickness and the refractive index of the film on the sensitivity of the sensor is studied. When 10 nm-thick titanium dioxide (TiO2) film is coated on the surface of the bare LPFG, the refractive index sensitivity of the sensor can be initially improved. Packaging PC452 UV-curable adhesive with a high-thermoluminescence coefficient for temperature sensitization can realize high-sensitivity temperature sensing and meet the requirements of ocean temperature detection. Finally, the effects of salt and protein attachment on the sensitivity are analyzed, which provides a reference for the subsequent application. The sensitivity of 3.8 nm/°C in the range of 5–30 °C was achieved for this new sensor, and the resolution is about 0.00026 °C, which is over 20 times higher than ordinary temperature sensors. This new sensor meets the accuracy and range of general ocean temperature measurements and could be used in various marine monitoring and environmental protection applications.

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Section: Introductionmentioning

confidence: 99%

High Sensitivity Temperature Sensing of Long-Period Fiber Grating for the Ocean

Zhang

Shi

et al. 2023

Sensors

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Design and simulation of ultra-sensitivity reflective SRI sensor based on TLPFG

Yan,

Gu,

Jiang

et al. 2023

J Opt

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Bio-Chemical Sensors Based on Excessively Tilted Fiber Grating

Chen,

Gu,

Luo

et al. 2024

Photonic Sens

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Excessively tilted fiber gratings (ExTFGs) are a type of special optical fiber grating device different from traditional fiber Bragg gratings, long period fiber gratings, and tilted fiber Bragg gratings. Due to the excessively tilted fiber fringe structure in the fiber core, ExTFGs could couple the light of the core mode into the high-order forward-propagating cladding modes, which would split into two sets of polarization dependent modes resulting in dual-peak resonances in the transmission spectrum. ExTFGs have the properties of the high refractive index sensitivity and low thermal crosstalk, which makes them very suitable for biochemical sensing applications. This paper will review the development of ExTFGs in terms of the mode coupling behavior, spectra characteristic, especially the refractive index sensitivity enhancement, biochemical modification methods of the sensor, and their applications in the bio-chemical sensing area, including pondus hydrogenii (pH) heavy metal ions, humidity, glucose, and immune sensing for various animal virus and biomarkers. Moreover, several composite sensing structures based on ExTFGs will be summarized.

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Titanium Dioxide Film Coated Excessively Tilted Fiber Grating for Ultra-Sensitive Refractive Index Sensor

Cited by 10 publications

References 45 publications

High Sensitivity Temperature Sensing of Long-Period Fiber Grating for the Ocean

High Sensitivity Temperature Sensing of Long-Period Fiber Grating for the Ocean

Design and simulation of ultra-sensitivity reflective SRI sensor based on TLPFG

Bio-Chemical Sensors Based on Excessively Tilted Fiber Grating

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