Highly sensitive refractive index sensor based on two cascaded microfiber knots with Vernier effect

Zhilin Xu; Qizhen Sun; Weihua Jia; Perry Ping Shum; Deming Liu

doi:10.1117/12.2059467

2 June 2014 Highly sensitive refractive index sensor based on two cascaded microfiber knots with Vernier effect

Zhilin Xu, Qizhen Sun, Weihua Jia, Perry Ping Shum, Deming Liu

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 915786 (2014) https://doi.org/10.1117/12.2059467
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

A highly sensitive refractive index (RI) sensor based on two cascaded microfiber knots with vernier effect is proposed and demonstrated by theoretical arithmetic. Deriving from high proportional evanescent field of microfiber and sharp spectrum fringes induced by vernier effect, a slight change of ambient RI will cause large variation of effective RI and significant wavelength shift of resonant peaks, indicating high sensitivity and resolution of the proposed compound resonator. Numerical analysis demonstrates a high sensitivity of 10000nm/RIU and a resolution of 5.57×10⁻⁵ RIU at the ambient RI around 1.33 for the fiber diameter of 1μm and cavity radii of R₁ = 500μm, R₂ = 547.62μm

Citation Download Citation

Zhilin Xu, Qizhen Sun, Weihua Jia, Perry Ping Shum, and Deming Liu "Highly sensitive refractive index sensor based on two cascaded microfiber knots with Vernier effect", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 915786 (2 June 2014); https://doi.org/10.1117/12.2059467

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