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48 results on '"Fan, Huibo"'

16. Investigation of Vibration and Sensing of Chalcogenide Microfiber Integrated with Hollow-core Fiber.

Author

Guo, Hongkun, Fan, Huili, He, Hui, Cheng, Liwen, and Fan, Huibo

Abstract

We propose and investigate a fiber-optic sensor of As2Se3 chalcogenide (ChG) microfiber laterally adhered on the hollow-core fiber (HCF) end face. HCF is fused with a single-mode fiber to form Fabry–Perot interferometer (FPI) between single-mode fiber (SMF) end face and ChG microfiber. ChG microfiber is ultra-sensitive to the small perturbations in the surroundings, because of its high refractive index and small Young's modulus. Furthermore, relative to traditional fiber-optic FPI comprised by thin film, our proposed FPI with thin-diameter ChG microfiber could respond to mechanical vibrations over a broad range of frequencies. Based on finite-element simulation, ChG microfiber has ultra-broadband dynamic frequency response, up to several hundreds of megahertz accompanied by a very small response strength decay, in comparison to the frequency response of ChG film which is typically less than 30 MHz. ChG microfiber-based FPI is also used in the static refractometric sensing with sensitivity of 1563 nm/RIU. Such a novel fiber-optic sensor offers excellent potential for the nondestructive detection and advanced biomedical sensing. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Nanometer refractive index sensor based on water droplet cavity structure with rectangular short rod.

Author

Wang, Jin, Yan, Shubin, Liu, Feng, Chang, Shuwen, Cao, Yuhao, Cui, Yang, Liu, Jilai, Zhang, Yi, Ren, Yifeng, Gupta, Preeti, and Fan, Huibo

Subjects
REFRACTIVE index, BAFFLES (Mechanical device), FANO resonance, FINITE element method, DETECTORS
Abstract

In this paper, a novel nano sensor structure is proposed, which consists of a metal-insulator-metal waveguide (MIM) with rectangular baffles and a water droplet cavity with rectangular stubs (WDCRS). The WDCRS structure optimizes the sensitivity of a single water droplet cavity and makes the transmission curve clearer and smoother. The transmission characteristics of WDCRS structure were simulated using finite element method (FEM). The transmission characteristics of the exported structure were analyzed in detail. In addition, the influence of structural geometric parameters on sensing performance was also studied, and it was found that the size of the water droplet cavity is a key factor in improving sensitivity. When applied to a refractive index sensor, the structure achieves a sensitivity of up to 2,300 nm/ RIU with a corresponding figure of merit (FOM) of 60.5. These works provide some ideas for the design of high-performance nanostructures and multiple Fano resonance excitation structures. [ABSTRACT FROM AUTHOR]

Published
2024
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41. Multiple Fano resonance refractive index sensor based on a plasmonic metal-insulator-metal based Taiji resonator

Author

Fan, Huibo, Fan, Hongwei, and Fan, Huili

Abstract

We propose and numerically analyze a multiple Fano resonance device with high quality (Q) factor and high modulation depth based on a metal-insulator-metal (MIM) waveguide laterally coupled Taiji resonator in the near-infrared regime. A silver-air-silver groove (SASG) is embedded in the MIM waveguide. The so-called Taiji resonator is an S-shaped additional crossover branch embedded in a ring cavity to selectively couple counterpropagating cavity modes, therefore increasing the propagating modes relative to the traditional ring cavity. Up to septuple Fano peaks rise from the interference between narrow discrete modes generated from the Taiji resonator and broad continuum modes stemming from the SASG, which can be easily tuned by adjusting the different geometric parameters of the proposed structure. The maximal Q-factor is about 317 with a modulation depth of 24.1 dB in transmission. Thanks to a narrow resonance linewidth with strong subwavelength light confinement of multiple Fano resonances, an optical refractive index sensor with a sensitivity of 2016 nm/RIU and figure of merit of 345 is demonstrated. Furthermore, the sensor can be used for sensing biological parameters such as glucose solution concentration with maximal sensitivity of 0.245 nm · L/g. This simple proposed structure may provide a further step for the development of Fano resonance applications in nanosensing, lasing, and nonlinear optics.

Published
2022

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