Theoretical and numerical studies of microfiber coil resonator for ambient refractive index sensing

Xiaodong Luo; Yongfang Li; Chengju Ma; Yinggang Liu; Dequan Feng; Zhang Jing

doi:10.1117/1.OE.57.11.117109

20 November 2018 Theoretical and numerical studies of microfiber coil resonator for ambient refractive index sensing

Xiaodong Luo, Yongfang Li, Chengju Ma, Yinggang Liu, Dequan Feng, Zhang Jing

Author Affiliations +

Optical Engineering, Vol. 57, Issue 11, 117109 (November 2018). https://doi.org/10.1117/1.OE.57.11.117109

Abstract

An ambient refractive index (RI) sensor based on a microfiber coil resonator (MCR) is proposed. Using the coupling wave theory, the resonant properties of the MCR are theoretically studied. And then, using the finite difference time-domain method, the sensing characteristic of the sensor is investigated and the dependence of sensing characteristic on the MCR parameters is examined as well. Results show that the sensor is extremely sensitive to the ambient RI variation. And, the microfiber diameter determines both the sensitivity and detection limit of the sensor. Further, the rod diameter determines the free spectral range of the MCR resonance spectrum and influences the detection range of the sensor. However, the sensor sensitivity is almost constant with the rod diameter change. So, for ensuring a good performance in actual experiment, the microfiber diameter should range from 400 nm to 1 μm, and the rod diameter should range from 20 μm to 2 mm. This work provides a guideline for future research on the RI sensor based on MCR.

Citation Download Citation

Xiaodong Luo, Yongfang Li, Chengju Ma, Yinggang Liu, Dequan Feng, and Zhang Jing "Theoretical and numerical studies of microfiber coil resonator for ambient refractive index sensing," Optical Engineering 57(11), 117109 (20 November 2018). https://doi.org/10.1117/1.OE.57.11.117109

Received: 24 July 2018; Accepted: 1 November 2018; Published: 20 November 2018

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