Optical RI sensor based on an in-fiber Bragg grating Fabry-Perot cavity embedded with a micro-channel

Yan, Zhijun; Saffari, Pouneh; Zhou, Kaiming; Adebay, Adedotun; Zhang, Lin

doi:10.1117/12.921410

Cited by 3 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2007年, Zhou课题组 [39] [40] Figure 5 (a) Microchannel on the surface of fiber; (b) microchannel across whole fiber section; (c) the schematics of the FBG FP RI sensor [40] 图 6 不同浓度液体中FBG结合(a) 5 m和(c) 35 m微隧道器件的干涉图; FBG结合(b) 5 m和(d) 35 m微隧道器件灵敏度拟合直线图 [40] Figure 6 Spectra of the (a) 5 μm and (c) 35 m micro-channel devices submerged in different RI oils; linear relation-plots between the wavelength of the resonant peak and RI of the oil for (b) 5 m and (d) 35 m micro-channel devices [40] 时, 该样品的光谱图发生了红移, 温度灵敏度为9.95 pm/℃, 线性度为0.995. 该方法得到的LPFG不需要精确的纵向定位, 可以提高加工速度与效率; 更为重要的是, 可以获得比普通方法更高的折射率灵敏度.…”

Section: 激光改性结合化学腐蚀方法的出现解决了这一难题mentioning

confidence: 99%

The fabrication of micro-nano structure optical fiber sensor used by femtosecond laser in combination with selective chemical etching

Chu¹,

Sun²,

Dong³

et al. 2015

Chin. Sci. Bull.

View full text Add to dashboard Cite

Section: 激光改性结合化学腐蚀方法的出现解决了这一难题mentioning

confidence: 99%

The fabrication of micro-nano structure optical fiber sensor used by femtosecond laser in combination with selective chemical etching

Chu¹,

Sun²,

Dong³

et al. 2015

Chin. Sci. Bull.

View full text Add to dashboard Cite

In-fiber interferometry sensors for refractive index

Aydin

Barnes

Loock

2023

Applied Physics Reviews

View full text Add to dashboard Cite

Compact interferometers based on waveguiding structures have found countless applications in refractive index measurements, chemical sensing, as well as temperature and pressure measurements. The most common fiber devices are based on Mach–Zehnder interferometry and Michelson interferometry—two design concepts that can readily be implemented using simple fiber optic components, such as mode splitters and combiners, fiber optic gratings, and fiber tapers, among others. Fiber interferometry can also be conducted based on the Sagnac effect and the Young (double-slit) interferometer. In this review, we examine and compare over 400 fiber optic interferometers as well as more than 60 fiber optic refractive sensors based on fiber optic cavities. Even though many of the devices show temperature-, strain-, and pressure-sensitivity, we focus our review on refractive index measurements, as these are the most common applications. Many devices were characterized by their inventors using their sensitivity to refractive index changes. While the sensitivity is an important characteristic of the device, it does not easily relate to the smallest resolvable refractive index change or the limit of detection when applied to chemical measurements. Instead, we propose here that one should use the figure of merit, which is defined through the refractive index sensitivity and the width of an interferometer fringe. Using simple assumptions, we were able to mathematically relate the sensitivity and the figure of merit to common design parameters, such as the length of the interferometer arms, the operating wavelength, refractive indices of the fiber and the sample, as well as an overlap parameter, which describes the fraction of the guided wave in the sensing arm that interacts with the sample. We determined this overlap parameter for each reviewed device from the reported interferograms. Our meta-analysis provides for the first time simple and easily applicable guidance to increase the figure of merit of fiber optic interferometers and fiber optic cavities with regard to their ability to detect small refractive index changes. A high figure of merit allows measuring very small refractive index changes such as those of gases at different pressures or of very dilute solutions.

show abstract

A Narrow Groove Structure Based Plasmonic Refractive Index Sensor

Hou

Ghaffar

et al. 2020

IEEE Access

View full text Add to dashboard Cite

A refractive index (RI) sensor based on plastic optical fiber (POF) with narrow groove structures coated with a gold layer (POF-NGS (Au)) is proposed and demonstrated. The proposed sensor was characterized using intensity interrogation, where the change in transmission power is induced by light filed interaction and Surface Plasmon Resonance (SPR). Narrow groove structures with lengths of 5 mm were fabricated using an ultraviolet laser, and a gold layer was sputtered to the surface of the whole fiber. The effect of the machining pitch on the RI response was studied. In this paper, dB and µW were used to represent the change of transmission power. Experiments have shown that the POF-NGS (Au) RI sensor has liner response between 1.340 and 1.356. The curvature of the output is largest when the machining pitch is 400 µm with sensitivity 12.5 dB/RIU (126 µW/RIU). The repeatability and temperature sensitivity characteristics were also characterized. Furthermore, the proposed sensor offers improved stability and signal to noise ratio. INDEX TERMS Narrow groove structures (NGS), intensity interrogation, light filed interaction, surface Plasmon resonance (SPR).

show abstract

Optical RI sensor based on an in-fiber Bragg grating Fabry-Perot cavity embedded with a micro-channel

Cited by 3 publications

References 16 publications

The fabrication of micro-nano structure optical fiber sensor used by femtosecond laser in combination with selective chemical etching

The fabrication of micro-nano structure optical fiber sensor used by femtosecond laser in combination with selective chemical etching

In-fiber interferometry sensors for refractive index

A Narrow Groove Structure Based Plasmonic Refractive Index Sensor

Contact Info

Product

Resources

About