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Abstract

Based on the coupling between the D-shape fiber and the microtube resonator in the whispering gallery mode, combined with the microfluidics, a refractive index sensor is proposed in this paper, in which the coupling region is fully encapsulated. This sensor requires a very little liquid sample (about 5 nL), is not fragile, and has better resistance to environmental perturbation, portability and repeatability than the general fiber-microcavity-coupled sensor. By the numerical simulation, the resonance properties of the microfluidic microtube resonator are investigated, and the refractive index sensing performance is analyzed. The research results show that the thickness of the mircotube-wall and the liquid refractive index have a great influence on the sensor performance. The shift of the resonance wavelength has a good linear relationship with the liquid refractive index. Meanwhile, the refractive index sensitivity is high (510.5–852.7 nm/RIU), and the Q-factor reaches up to 5.53×10 ⁴, the detection limit can arrive at 2.11 × 10 ^–6.

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Authors and contacts

Corresponding author:Wan Jing,wanj@njupt.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 61574080).

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微管壁的厚度/μm	液体的折射率
	1.450—1.458		1.500—1.504
	Q值	灵敏度/ (nm·RIU^–1)	Q值	灵敏度/ ( nm·RIU^–1)
	Q值	灵敏度/ (nm·RIU^–1)	Q值	灵敏度/ ( nm·RIU^–1)
1.5	2.42 × 10³	238.3	1.10 × 10⁴	709.7
1	2.77 × 10³	510.7	1.15 × 10⁴	815.6
0.5	3.86 × 10³	805.2	5.00 × 10⁴	914.4

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液体折射率	谐振模式	谐振波长/nm	自由光谱范围/nm	半高线宽/nm	Q值
液体折射率	谐振模式	谐振波长/nm	自由光谱范围/nm	半高线宽/nm	Q值	1.450	$ {\mathrm{T}\mathrm{E}}_{293}^{1} $	1543.75	5.27 5.32	0.555	2.78 × 10³
$ {\mathrm{T}\mathrm{E}}_{292}^{1} $	1549.02	0.560	2.77 × 10³
$ {\mathrm{T}\mathrm{E}}_{291}^{1} $	1554.34	0.570	2.73 × 10³
1.500	$ {\mathrm{T}\mathrm{E}}_{302}^{1} $	1544.73	5.19 5.21	0.132	1.17 × 10⁴
	$ {\mathrm{T}\mathrm{E}}_{301}^{1} $	1549.92		0.135	1.15 × 10⁴
	$ {\mathrm{T}\mathrm{E}}_{300}^{1} $	1555.13		0.139	1.12 × 10⁴
1.700	$ {\mathrm{T}\mathrm{E}}_{341}^{6} $	1549.29	4.78 4.86	0.028	5.53 × 10⁴
	$ {\mathrm{T}\mathrm{E}}_{340}^{6} $	1554.07		0.029	5.36 × 10⁴
	$ {\mathrm{T}\mathrm{E}}_{339}^{6} $	1558.90		0.030	5.20 × 10⁴

DownLoad: CSV

液体折射率	Q值	灵敏度/(nm·RIU^–1)	探测极限
1.450—1.458	(2.73—2.78) × 10³	510.5—515.3	(6.52—6.63) × 10^–5
1.500—1.504	(1.12—1.17) × 10⁴	813.1—818.3	(0.97—1.02) × 10^–5
1.696—1.700	(5.20—5.53) × 10⁴	848.2—852.7	(1.98—2.11) × 10^–6

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Vol. 71, Issue 21 - 2022-11-05

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