[3] Lai Y, Zhou K, Zhang L et al. Microchannels in conventional single-mode fibers[J]. Optics Letters, 31, 2559-2561(2006).
[4] Marowsky G. Planar waveguides and other confined geometries: theory, technology, production, and novel applications[M]. New York: Springer, 69-83(2014).
[5] Wu D K C, Kuhlmey B T, Eggleton B J. Ultrasensitive photonic crystal fiber refractive index sensor[J]. Optics Letters, 34, 322-324(2009).
[6] Gattass R R, Mazur E. Femtosecond laser micromachining in transparent materials[J]. Nature Photonics, 2, 219-225(2008).
[7] Liao Y, Zeng B, Qiao L et al. Threshold effect in femtosecond laser induced nanograting formation in glass: influence of the pulse duration[J]. Applied Physics A, 114, 223-230(2014).
[8] Osellame R, Maselli V, Vazquez R M et al. Integration of optical waveguides and microfluidic channels both fabricated by femtosecond laser irradiation[J]. Applied Physics Letters, 90, 231118(2007).
[10] Fu H, Zhou K, Saffari P et al. Microchanneled chirped fiber Bragg grating formed by femtosecond laser-aided chemical etching for refractive index and temperature measurements[J]. IEEE Photonics Technology Letters, 20, 1609-1611(2008).
[11] Sugioka K, Cheng Y. Ultrafast lasers—reliable tools for advanced materials processing[J]. Light: Science & Applications, 3, e149(2014).
[12] Wang Y, Wang D N, Yang M et al. Refractive index sensor based on a microhole in single-mode fiber created by the use of femtosecond laser micromachining[J]. Optics letters, 34, 3328-3330(2009).
[13] Zhou K, Yan Z, Zhang L et al. Refractometer based on fiber Bragg grating Fabry-Perot cavity embedded with a narrow microchannel[J]. Optics Express, 19, 11769-11779(2011).
[14] Liu Y, Qu S, Li Y. Liquid refractive index sensor with three-cascaded microchannels in single-mode fiber fabricated by femtosecond laser-induced water breakdown[J]. Applied Physics B, 110, 585-589(2013).
[15] Teng L, Zhang H, Dong Y et al. Temperature-compensated distributed hydrostatic pressure sensor with a thin-diameter polarization-maintaining photonic crystal fiber based on Brillouin dynamic gratings[J]. Optics Letters, 41, 4413-4416(2016).
[16] Jia P, Fang G, Liang T et al. Temperature-compensated fiber-optic Fabry-Perot interferometric gas refractive-index sensor based on hollow silica tube for high-temperature application[J]. Sensors and Actuators B: Chemical, 244, 226-232(2017).
[18] Li J, Sun L P, Gao S et al. Ultrasensitive refractive-index sensors based on rectangular silica microfibers[J]. Optics Letters, 36, 3593-3595(2011).