Fang Fang, Bing Sun, Zuxing Zhang, Jing Xu, Lin Zhang, "Improvement on refractive index sensing by exploiting the tapered two-mode fibers," Chin. Opt. Lett. 17, 110604 (2019)

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- Chinese Optics Letters
- Vol. 17, Issue 11, 110604 (2019)

Fig. 1. Schematic diagram of the sensor. Continuous-mode evolutions of and modes when the two modes are launched into the fiber, respectively.

Fig. 2. Calculated dispersion factor coefficient G along with the microfiber diameter variation in the external medium of (a) air and (b) 1.33. (c) Simulated RI sensitivities for the TTMF when .

Fig. 3. Variation of the interference spectra of the TTMF when immersed in (a) air, (b) flow cells, and (c) glycerol solution.

Fig. 4. (a) Variation of interferential spectra as the ambient RIs increase from 1.32658 to 1.32875. (b) Wavelength shifts of dips (A, B, and C) versus ambient RIs.

Fig. 5. Transmission spectra and FWHM of the proposed sensor in glycerol solution with RI ranging from 1.32658 to 1.32688.

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