[1] Xu Y P, Lu P, Chen L et al. Recent developments in micro-structured fiber optic sensors[J]. Fibers, 5, 3(2017).

[2] Tong L M. Micro/nanofibre optical sensors: challenges and prospects[J]. Sensors, 18, 903(2018).

[3] Tong L M, Gattass R R, Ashcom J B et al. Subwavelength-diameter silica wires for low-loss optical wave guiding[J]. Nature, 426, 816-819(2003).

[4] Dai F, Li K W, Zhou W C et al. Highly sensitive optical nano fiber bio-chemical sensor based on magnetic nanoparticles amplication[J]. Acta Optica Sinica, 34, 1206003(2014).

[5] Li M, Li K W, Dai F et al. Highly sensitive optical nanofiber sensor based on gold nanorod amplification[J]. Acta Optica Sinica, 35, 1206001(2015).

[6] Lee B, Roh S, Park J. Current status of micro- and nano-structured optical fiber sensors[J]. Optical Fiber Technology, 15, 209-221(2009).

[7] Kieu K Q, Mansuripur M. Biconical fiber taper sensors[J]. IEEE Photonics Technology Letters, 18, 2239-2241(2006).

[8] Shen C Y, Wang Y Q, Chu J L et al. Optical fiber axial micro-displacement sensor based on Mach-Zehnder interferometer[J]. Optics Express, 22, 31984-31992(2014).

[9] Wu X Q, Tong L M. Optical microfibers and nanofibers[J]. Nanophotonics, 2, 407-428(2013).

[10] Tyagi D, Mishra S K, Zou B et al. Nano-functionalized long-period fiber grating probe for disease-specific protein detection[J]. Journal of Materials Chemistry B, 6, 386-392(2018).

[11] Li K W, Zhou W C, Zeng S W. Optical micro/nanofiber-based localized surface plasmon resonance biosensors: fiber diameter dependence[J]. Sensors, 18, 3295(2018).

[12] Rifat A A, Ahmed R, Yetisen A K et al. Photonic crystal fiber based plasmonic sensors[J]. Sensors and Actuators B: Chemical, 243, 311-325(2017).

[13] Zibaii M I, Kazemi A, Latifi H et al. Measuring bacterial growth by refractive index tapered fiber optic biosensor[J]. Journal of Photochemistry and Photobiology B: Biology, 101, 313-320(2010).

[14] Ji W B, Liu H H, Tjin S C et al. Ultrahigh sensitivity refractive index sensor based on optical microfiber[J]. IEEE Photonics Technology Letters, 24, 1872-1874(2012).

[15] Nagai R, Aoki T. Ultra-low-loss tapered optical fibers with minimal lengths[J]. Optics Express, 22, 28427-28436(2014).

[16] Zhou T M, Zhang Y N, Han B et al. Low cost non-adiabatic tapered fiber for high-sensitive temperature sensing[J]. Optical Fiber Technology, 45, 53-57(2018).

[17] Riahi A, Vahedi M, Khalilzadeh J et al. Investigation of the effect of the taper geometry on the sensitivity of tapered-fibre gas sensors[J]. Journal of Modern Optics, 67, 1259-1266(2020).

[18] Li K W, Zhang T, Liu G G et al. Ultrasensitive optical microfiber coupler based sensors operating near the turning point of effective group index difference[J]. Applied Physics Letters, 109, 101101(2016).

[19] Luo H, Sun Q, Li X et al. Refractive index sensitivity characteristics near the dispersion turning point of the multimode microfiber-based Mach-Zehnder interferometer[J]. Optics Letters, 40, 5042-5045(2015).

[20] Zhang N M Y, Li K W, Zhang N et al. Highly sensitive gas refractometers based on optical microfiber modal interferometers operating at dispersion turning point[J]. Optics Express, 26, 29148-29158(2018).

[21] Ravets S, Hoffman J E, Kordell P R et al. Intermodal energy transfer in a tapered optical fiber: optimizing transmission[J]. Journal of the Optical Society of America A, 30, 2361-2371(2013).

[22] Xu Y X, Fang W, Tong L M. Real-time control of micro/nanofiber waist diameter with ultrahigh accuracy and precision[J]. Optics Express, 25, 10434-10440(2017).

[23] Birks T A, Li Y W. The shape of fiber tapers[J]. Journal of Lightwave Technology, 10, 432-438(1992).

[24] Li X C, Liu L H, Zhao J M et al. Optical properties of sodium chloride solution within the spectral range from 300 to 2500 nm at room temperature[J]. Applied Spectroscopy, 69, 635-640(2015).