Highly sensitive near-infrared surface plasmon resonance (SPR) sensor based on birefringent six-core photonic crystal fibre

Abstract

A new type of highly sensitive near-infrared birefringent six-core photonic crystal fibre sensor using surface plasmon resonance (SPR) is proposed. By using the full-vector finite element method, the impacts of the fibre parameters on the wavelength sensitivity and amplitude sensitivity are numerically studied. The numerical results indicate that, benefiting from the high birefringent multi-core fibre structure, an average sensitivity of 8083 nm/refractive index unit (RIU) within the wavelength range from 1.532 to 2.02 µm is achieved when the analyte refractive index (RI) lies in (1.372, 1.432). Moreover, the maximum amplitude sensitivity is as high as 226 RIU⁻¹ if the analyte RI is adjusted from 1.372 to 1.382. In consideration of its excellent sensing performance, the proposed SPR multi-core PCF sensor can be applied in environmental, food safety, and (bio)chemical detection.

KEYWORDS:

• Surface plasmon resonance
• photonic crystal fibre
• fibre optics sensors

Acknowledgements

This work was supported by the National Natural Science Foundation of China under grant 61765003; Natural Science Foundation of Jiangxi Province under grant 20181BAB202029; National Natural Science Foundation of China under grant 61605179; Educational Committee Science Foundation of Jiangxi Province under grant GJJ18075; Wuhan Science and Technology Bureau under grant 2018010401011297.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China under grant [61765003]; Natural Science Foundation of Jiangxi Province under grant [20181BAB202029]; National Natural Science Foundation of China under grant [61605179]; Education Department of Jiangxi Province under grant [GJJ18075]; Wuhan Municipal Science and Technology Bureau under grant [2018010401011297].