Highly Sensitive Multi-coating Photonic Crystal Fiber Biosensor at Near-Infrared Waveband

Li, Duanming; Zhang, Wei; Hu, Jiangfei; Gu, Miṅ

doi:10.1109/ogc55558.2022.10050954

Cited by 1 publication

(1 citation statement)

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“…Since the penetration depth is proportional to the working wavelength, compared with visible light, NIR light can penetrate deeply into biological tissues, which means that the evanescent wave in the NIR band is conducive to improving the detection sensitivity of SPR sensors for biological macromolecular targets, and avoid photodamage and phototoxicity to biological materials due to its non-ionizing nature. Therefore, NIR light has great application value in the fields of medical imaging and biosensing [9][10][11][12]. To achieve a wider range of NIR sensing, a suitable plasma material needs to be selected.…”

Section: Introductionmentioning

confidence: 99%

Characterization of incompletely coated D-shaped PCF-SPR refractive index sensors

Jiang,

Shen,

Feng

et al. 2023

Phys. Scr.

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To reduce the complexity of the sensor structure and improve the sensitivity of refractive index (RI) measurement, a D-shaped photonic crystal fiber (PCF) surface plasmon resonance (SPR) RI sensor with incomplete coating of gold-tantalum pentoxide (Au-Ta2O5) on the surface is proposed. When the coating width is 3.1μm, the sensor can detect RI samples ranging from 1.35 to 1.41 in the ultra-wide near-infrared (NIR) region of 1100-2100 nm wavelength. Its maximum wavelength sensitivity is 20,000 nm/RIU, maximum amplitude sensitivity is 2817.7 RIU-1, resolution is 5×10-6RIU, and figure of merit (FOM) is 333.3RIU-1. This sensor can be widely used in biological tissue detection. For this type of incomplete coated D-shaped sensor, the coating material and structural parameters not only affect the performance of the sensor, but also change the RI detection range, which has been ignored or not mentioned in previous literature on PCF-SPR sensors. Therefore, the reasons for the change of RI detection interval and negative optimization caused by structural parameters were analyzed, and two different sensors with different coating widths were finally obtained, which can achieve high sensitivity sensing in their respective detection intervals. The detailed research results expand the understanding of the SPR phenomenon in D-shaped PCF and provide theoretical guidance for adjusting and improving the detection performance of PCF-SPR sensors.

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Section: Introductionmentioning

confidence: 99%