{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,1]],"date-time":"2026-04-01T10:50:26Z","timestamp":1775040626848,"version":"3.50.1"},"reference-count":96,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2014,3,25]],"date-time":"2014-03-25T00:00:00Z","timestamp":1395705600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>With diameter close to or below the wavelength of guided light and high index contrast between the fiber core and the surrounding, an optical microfiber shows a variety of interesting waveguiding properties, including widely tailorable optical confinement, evanescent fields and waveguide dispersion. Among various microfiber applications, optical sensing has been attracting increasing research interest due to its possibilities  of realizing miniaturized fiber optic sensors with small footprint, high sensitivity, fast response, high flexibility and low optical power consumption. Here we review recent progress in microfiber optical sensors regarding their fabrication, waveguide properties and sensing applications. Typical microfiber-based sensing structures, including biconical tapers, optical gratings, circular cavities, Mach-Zehnder interferometers and functionally coated\/doped microfibers, are summarized. Categorized by sensing structures, microfiber optical sensors for refractive index, concentration, temperature, humidity, strain and current measurement in gas or liquid environments are reviewed. Finally, we conclude with an outlook for challenges and opportunities of microfiber optical sensors.<\/jats:p>","DOI":"10.3390\/s140405823","type":"journal-article","created":{"date-parts":[[2014,3,25]],"date-time":"2014-03-25T12:33:44Z","timestamp":1395750824000},"page":"5823-5844","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":220,"title":["Microfiber Optical Sensors: A Review"],"prefix":"10.3390","volume":"14","author":[{"given":"Jingyi","family":"Lou","sequence":"first","affiliation":[{"name":"College of Science, Zhejiang University of Science and Technology, Hangzhou 310023, China"}]},{"given":"Yipei","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Lab of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China"}]},{"given":"Limin","family":"Tong","sequence":"additional","affiliation":[{"name":"State Key Lab of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China"}]}],"member":"1968","published-online":{"date-parts":[[2014,3,25]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Udd, E., and Spillman, W.B. (2011). Fiber Optic Sensors: An Introduction for Engineers and Scientists, John Wiley & Sons, Inc.. [2rd ed.].","DOI":"10.1002\/9781118014103"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Tong, L., and Sumetsky, M. (2009). Subwavelength and Nanometer Diameter Optical Fibers, Zhejiang University Press.","DOI":"10.1007\/978-3-642-03362-9"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"407","DOI":"10.1515\/nanoph-2013-0033","article-title":"Optical microfibers and nanofibers","volume":"2","author":"Wu","year":"2013","journal-title":"Nanophotonics"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"656","DOI":"10.1021\/ar400232h","article-title":"Photonic nanowires: From subwavelength waveguides to optical sensors","volume":"47","author":"Guo","year":"2014","journal-title":"Acc. Chem. Res."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"043001","DOI":"10.1088\/2040-8978\/12\/4\/043001","article-title":"Optical fibre nanowires and microwires: A review","volume":"12","author":"Brambilla","year":"2010","journal-title":"J. Opt."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"107","DOI":"10.1364\/AOP.1.000107","article-title":"Optical fiber nanowires and microwires: Fabrication and applications","volume":"1","author":"Brambilla","year":"2009","journal-title":"Adv. Opt. Photon."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"4641","DOI":"10.1016\/j.optcom.2012.07.068","article-title":"Optical microfibers and nanofibers: A tutorial","volume":"285","author":"Tong","year":"2012","journal-title":"Opt.Commun."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"8861","DOI":"10.3390\/s120708861","article-title":"Microfiber-based bragg gratings for sensing applications: A review","volume":"12","author":"Kou","year":"2012","journal-title":"Sensors"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"816","DOI":"10.1038\/nature02193","article-title":"Subwavelength-diameter silica wires for low-loss optical wave guiding","volume":"426","author":"Tong","year":"2003","journal-title":"Nature"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1025","DOI":"10.1364\/OPEX.12.001025","article-title":"Single-mode guiding properties of subwavelength-diameter silica and silicon wire waveguides","volume":"12","author":"Tong","year":"2004","journal-title":"Opt. Express"},{"key":"ref_11","unstructured":"Snyder, A.W., and Love, J. (1983). Optical Waveguide Theory, Chapman and Hall."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"2135","DOI":"10.1364\/OPEX.13.002135","article-title":"Modeling of silica nanowires for optical sensing","volume":"13","author":"Lou","year":"2005","journal-title":"Opt. Express"},{"key":"ref_13","unstructured":"Klocek, P. (1991). Handbook of Infrared Optical Materials, Marcel Dekker."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"677","DOI":"10.1063\/1.555859","article-title":"Refractive index of water and steam as function of wavelength, temperature and density","volume":"19","author":"Schiebener","year":"1990","journal-title":"J. Phys. Chem. Ref. Data"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"2258","DOI":"10.1364\/OPEX.12.002258","article-title":"Ultra-low-loss optical fiber nanotapers","volume":"12","author":"Brambilla","year":"2004","journal-title":"Opt. Express"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"870","DOI":"10.1364\/OL.31.000870","article-title":"How thin can a microfiber be and still guide light?","volume":"31","author":"Sumetsky","year":"2006","journal-title":"Opt. Lett."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"11952","DOI":"10.1364\/OE.15.011952","article-title":"Ultra-sensitive surface absorption spectroscopy using sub-wavelength diameter optical fibers","volume":"15","author":"Warken","year":"2007","journal-title":"Opt. Express"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"2864","DOI":"10.1364\/OPEX.12.002864","article-title":"Supercontinuum generation in submicron fibre waveguides","volume":"12","author":"Birks","year":"2004","journal-title":"Opt. Express"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1445","DOI":"10.1088\/0957-4484\/16\/9\/004","article-title":"Self-modulated taper drawing of silica nanowires","volume":"16","author":"Tong","year":"2005","journal-title":"Nanotechnology"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"3426","DOI":"10.1364\/OE.18.003426","article-title":"Tapering fibers with complex shape","volume":"18","author":"Pricking","year":"2010","journal-title":"Opt. Express"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"3828","DOI":"10.1364\/OE.18.003828","article-title":"Highly birefringent optical microfibers","volume":"18","author":"Xuan","year":"2010","journal-title":"Opt. Express"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"400","DOI":"10.1049\/el:20058381","article-title":"Compound-glass optical nanowires","volume":"41","author":"Brambilla","year":"2005","journal-title":"Electron. Lett."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"5055","DOI":"10.1364\/OE.14.005055","article-title":"Fabrication of submicron-diameter silica fibers using electric strip heater","volume":"14","author":"Shi","year":"2006","journal-title":"Opt. Express"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"291","DOI":"10.1007\/s00340-010-4056-0","article-title":"Near-field characterization of glass microfibers on a low-index substrate","volume":"101","author":"Coillet","year":"2010","journal-title":"Appl. Phys. B"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"6845","DOI":"10.1364\/AO.38.006845","article-title":"Carbon dioxide laser fabrication of fused-fiber couplers and tapers","volume":"38","author":"Dimmick","year":"1999","journal-title":"Appl. Opt."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"3521","DOI":"10.1364\/OPEX.12.003521","article-title":"Fabrication and study of bent and coiled free silica nanowires: Self-coupling microloop optical interferometer","volume":"12","author":"Sumetsky","year":"2004","journal-title":"Opt. Express"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"11568","DOI":"10.1364\/OE.16.011568","article-title":"Low loss fusion splicing of micron scale silica fibers","volume":"16","author":"Pal","year":"2008","journal-title":"Opt. Express"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1075","DOI":"10.1109\/LPT.2010.2049646","article-title":"Fusion spliced microfiber closed-loop resonators","volume":"22","author":"Wang","year":"2010","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"82","DOI":"10.1364\/OPEX.14.000082","article-title":"Photonic nanowires directly drawn from bulk glasses","volume":"14","author":"Tong","year":"2006","journal-title":"Opt. Express"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"3770","DOI":"10.1002\/adma.201101392","article-title":"Quantum-dot-doped polymer nanofibers for optical sensing","volume":"23","author":"Meng","year":"2011","journal-title":"Adv. Mater."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"3145","DOI":"10.1021\/nl301055f","article-title":"Polymer nanofibers embedded with aligned gold nanorods: A new platform for plasmonic studies and optical sensing","volume":"12","author":"Wang","year":"2012","journal-title":"Nano Lett."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"1273","DOI":"10.1364\/OL.30.001273","article-title":"Evanescent field-based optical fiber sensing device for measuring the refractive index of liquids in microfluidic channels","volume":"30","author":"Polynkin","year":"2005","journal-title":"Opt. Lett."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"3720","DOI":"10.1039\/c1lc20519f","article-title":"Ultra-sensitive microfibre absorption detection in a microfluidic chip","volume":"11","author":"Zhang","year":"2011","journal-title":"Lab Chip"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"355","DOI":"10.1088\/0957-0233\/8\/4\/002","article-title":"In-fibre Bragg grating sensors","volume":"8","author":"Rao","year":"1997","journal-title":"Meas. Sci. Technol."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"21882","DOI":"10.1364\/OE.17.021882","article-title":"CO2 laser induced long period gratings in optical microfibers","volume":"17","author":"Xuan","year":"2009","journal-title":"Opt. Express"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"26345","DOI":"10.1364\/OE.18.026345","article-title":"Refractive index sensing based on higher-order mode reflection of a microfiber Bragg grating","volume":"18","author":"Zhang","year":"2010","journal-title":"Opt. Express"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"18577","DOI":"10.1364\/OE.19.018577","article-title":"193 nm excimer laser inscribed Bragg gratings in microfibers for refractive index sensing","volume":"19","author":"Ran","year":"2011","journal-title":"Opt. Express"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"1007","DOI":"10.1364\/OL.35.001007","article-title":"Femtosecond laser fabricated fiber Bragg grating in microfiber for refractive index sensing","volume":"35","author":"Fang","year":"2010","journal-title":"Opt. Lett."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"151122","DOI":"10.1063\/1.1904716","article-title":"Highly sensitive fiber Bragg grating refractive index sensors","volume":"86","author":"Liang","year":"2005","journal-title":"Appl. Phys. Lett."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"051105","DOI":"10.1063\/1.3621836","article-title":"A microfiber cavity with minimal-volume confinement","volume":"99","author":"Ding","year":"2011","journal-title":"Appl. Phys. Lett."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"18452","DOI":"10.1364\/OE.19.018452","article-title":"Demonstration of a compact temperature sensor based on first-order Bragg grating in a tapered fiber probe","volume":"19","author":"Kou","year":"2011","journal-title":"Opt. Express"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"3115","DOI":"10.1364\/OL.36.003115","article-title":"Compact microfiber Bragg gratings with high-index contrast","volume":"36","author":"Liu","year":"2011","journal-title":"Opt. Lett."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"14040","DOI":"10.1364\/OE.19.014040","article-title":"Cavity formation on an optical nanofiber using focused ion beam milling technique","volume":"19","author":"Nayak","year":"2011","journal-title":"Opt. Express"},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"274","DOI":"10.1080\/09500340.2011.628128","article-title":"Nanofibers with Bragg gratings from equidistant holes","volume":"59","author":"Nayak","year":"2012","journal-title":"J. Mod. Opt."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"85","DOI":"10.1364\/OL.35.000085","article-title":"Long-period gratings in wavelength-scale microfibers","volume":"35","author":"Xuan","year":"2010","journal-title":"Opt. Lett."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"218","DOI":"10.1109\/LPT.2009.2037515","article-title":"A microfiber Bragg grating based on a microstructured rod: A proposal","volume":"22","author":"Xu","year":"2010","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"20866","DOI":"10.1364\/OE.17.020866","article-title":"A microfluidic refractometric sensor based on gratings in optical fibre microwires","volume":"17","author":"Xu","year":"2009","journal-title":"Opt. Express"},{"key":"ref_48","unstructured":"Sumetsky, M., Dulashko, Y., and Fishteyn, M. (, January March). Demonstration of a Multi-Turn Microfiber Coil Resonator. Anaheim, CA, USA."},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"242","DOI":"10.1109\/JLT.2005.861127","article-title":"The microfiber loop resonator: Theory, experiment, and application","volume":"24","author":"Sumetsky","year":"2006","journal-title":"J. Lightw. Technol."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"073512","DOI":"10.1063\/1.2771526","article-title":"Demonstration of critical coupling in microfiber loops wrapped around a copper rod","volume":"91","author":"Guo","year":"2007","journal-title":"Appl. Phys. Lett."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"14429","DOI":"10.1364\/OE.16.014429","article-title":"Supported microfiber loops for optical sensing","volume":"16","author":"Guo","year":"2008","journal-title":"Opt. Express"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"1386","DOI":"10.1109\/LPT.2007.903340","article-title":"Effect of host polymer on microfiber resonator","volume":"19","author":"Vienne","year":"2007","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"2164","DOI":"10.1364\/OL.32.002164","article-title":"Embedding optical microfiber coil resonators in Teflon","volume":"32","author":"Xu","year":"2007","journal-title":"Opt. Lett."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"2724","DOI":"10.1364\/OL.34.002724","article-title":"Tapered fibers embedded in silica aerogel","volume":"34","author":"Xiao","year":"2009","journal-title":"Opt. Lett."},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"223501","DOI":"10.1063\/1.2207986","article-title":"Demonstration of optical microfiber knot resonators","volume":"88","author":"Jiang","year":"2006","journal-title":"Appl. Phys. Lett."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"689","DOI":"10.3390\/s7050689","article-title":"Simulation of optical microfiber loop resonators for ambient refractive index sensing","volume":"7","author":"Shi","year":"2007","journal-title":"Sensors"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"18142","DOI":"10.1364\/OE.17.018142","article-title":"Miniature fiber-optic temperature sensors based on silica\/polymer microfiber knot resonators","volume":"17","author":"Wu","year":"2009","journal-title":"Opt. Express"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"014402","DOI":"10.1117\/1.3294883","article-title":"Novel high sensitivity accelerometer based on a microfiber loop resonator","volume":"49","author":"Hou","year":"2010","journal-title":"Opt. Eng."},{"key":"ref_59","doi-asserted-by":"crossref","unstructured":"Harun, S.W., Lim, K.S., Damanhuri, S.S.A., and Ahmad, H. (2011). Microfiber loop resonator based temperature sensor. J. Eur. Opt. Soc. Rapid Publ., 6.","DOI":"10.2971\/jeos.2011.11026"},{"key":"ref_60","doi-asserted-by":"crossref","first-page":"14217","DOI":"10.1364\/OE.19.014217","article-title":"Optically tunable microfiber-knot resonator","volume":"19","author":"Chen","year":"2011","journal-title":"Opt. Express"},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"258","DOI":"10.1016\/j.snb.2010.12.030","article-title":"Miniature interferometric humidity sensors based on silica\/polymer microfiber knot resonators","volume":"155","author":"Wu","year":"2011","journal-title":"Sens. Actuators B Chem."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"831","DOI":"10.1109\/LPT.2011.2140369","article-title":"Fusion splicing soft glass microfibers for photonic devices","volume":"23","author":"Li","year":"2011","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"1098","DOI":"10.1364\/OL.36.001098","article-title":"High finesse microfiber knot resonators made from double-ended tapered fibers","volume":"36","author":"Xiao","year":"2011","journal-title":"Opt. Lett."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"095107","DOI":"10.1063\/1.3633955","article-title":"Etched multimode microfiber knot-type loop interferometer refractive index sensor","volume":"82","author":"Pal","year":"2011","journal-title":"Rev. Sci. Instrum."},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"10180","DOI":"10.1364\/OE.20.010180","article-title":"Miniature highly-birefringent microfiber loop with extremely-high refractive index sensitivity","volume":"20","author":"Sun","year":"2012","journal-title":"Opt. Express"},{"key":"ref_66","doi-asserted-by":"crossref","first-page":"3017","DOI":"10.1364\/AO.51.003017","article-title":"Modeling optical microfiber loops for seawater sensing","volume":"51","author":"Wang","year":"2012","journal-title":"Appl. Opt."},{"key":"ref_67","doi-asserted-by":"crossref","first-page":"1547","DOI":"10.1109\/LPT.2009.2029556","article-title":"MOEMS accelerometer based on microfiber knot resonator","volume":"21","author":"Wu","year":"2009","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_68","doi-asserted-by":"crossref","first-page":"60","DOI":"10.1016\/j.sna.2011.02.036","article-title":"Current sensor based on microfiber knot resonator","volume":"167","author":"Lim","year":"2011","journal-title":"Sens. Actuators A Phys."},{"key":"ref_69","doi-asserted-by":"crossref","first-page":"11782","DOI":"10.3390\/s120911782","article-title":"Integrated microfibre device for refractive index and temperature sensing","volume":"12","author":"Lim","year":"2012","journal-title":"Sensors"},{"key":"ref_70","doi-asserted-by":"crossref","first-page":"G7","DOI":"10.1364\/AO.50.0000G7","article-title":"Polymer microfiber rings for high-sensitivity optical humidity sensing","volume":"50","author":"Wang","year":"2011","journal-title":"Appl. Opt."},{"key":"ref_71","doi-asserted-by":"crossref","first-page":"2218","DOI":"10.1016\/j.optcom.2011.12.107","article-title":"Microscopic multi-point temperature sensing based on microfiber double-knot resonators","volume":"285","author":"Wu","year":"2012","journal-title":"Opt.Commun."},{"key":"ref_72","doi-asserted-by":"crossref","first-page":"3817","DOI":"10.1016\/j.optcom.2009.05.079","article-title":"A temperature sensor based on optical microfiber knot resonator","volume":"282","author":"Zeng","year":"2009","journal-title":"Opt.Commun."},{"key":"ref_73","doi-asserted-by":"crossref","first-page":"5187","DOI":"10.1364\/OL.37.005187","article-title":"All-fiber magnetic-field sensor based on microfiber knot resonator and magnetic fluid","volume":"37","author":"Li","year":"2012","journal-title":"Opt. Lett."},{"key":"ref_74","doi-asserted-by":"crossref","first-page":"7888","DOI":"10.1364\/OE.15.007888","article-title":"Optical microfiber coil resonator refractometric sensor","volume":"15","author":"Xu","year":"2007","journal-title":"Opt. Express"},{"key":"ref_75","doi-asserted-by":"crossref","first-page":"101126","DOI":"10.1063\/1.2898211","article-title":"Demonstration of a refractometric sensor based on optical microfiber coil resonator","volume":"92","author":"Xu","year":"2008","journal-title":"Appl. Phys. Lett."},{"key":"ref_76","doi-asserted-by":"crossref","first-page":"173504","DOI":"10.1063\/1.3582924","article-title":"In-line absorption sensor based on coiled optical microfiber","volume":"98","author":"Lorenzi","year":"2011","journal-title":"Appl. Phys. Lett."},{"key":"ref_77","doi-asserted-by":"crossref","first-page":"4720","DOI":"10.1364\/OL.37.004720","article-title":"Compact acoustic sensor based on air-backed mandrel coiled with optical microfiber","volume":"37","author":"Chen","year":"2012","journal-title":"Opt.Lett."},{"key":"ref_78","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1049\/el.2012.3554","article-title":"Inspection of electrical wires for insulation faults and current surges using sliding temperature sensor based on optical microfibre coil resonator","volume":"49","author":"Chen","year":"2013","journal-title":"Electron. Lett."},{"key":"ref_79","doi-asserted-by":"crossref","first-page":"303","DOI":"10.1364\/OL.33.000303","article-title":"Mach-Zehnder interferometers assembled with optical microfibers or nanofibers","volume":"33","author":"Li","year":"2008","journal-title":"Opt. Lett."},{"key":"ref_80","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1364\/OL.37.000067","article-title":"Refractive index sensor using microfiber-based Mach\u2013Zehnder interferometer","volume":"37","author":"Wo","year":"2012","journal-title":"Opt. Lett."},{"key":"ref_81","doi-asserted-by":"crossref","first-page":"298","DOI":"10.1049\/iet-opt.2012.0025","article-title":"Microfibre Mach-Zehnder interferometer and its application as a current sensor","volume":"6","author":"Jasim","year":"2012","journal-title":"IET Optoelectron."},{"key":"ref_82","doi-asserted-by":"crossref","first-page":"15698","DOI":"10.1364\/OE.21.015698","article-title":"All-fiber hybrid photon-plasmon circuits: Integrating nanowire plasmonics with fiber optics","volume":"21","author":"Li","year":"2013","journal-title":"Opt. Express"},{"key":"ref_83","doi-asserted-by":"crossref","first-page":"5087","DOI":"10.1364\/OPEX.13.005087","article-title":"Fast detection of hydrogen with nano fiber tapers coated with ultra thin palladium layers","volume":"13","author":"Villatoro","year":"2005","journal-title":"Opt. Express"},{"key":"ref_84","doi-asserted-by":"crossref","first-page":"13349","DOI":"10.1364\/OE.16.013349","article-title":"Fast detection of humidity with a subwavelength-diameter fiber taper coated with gelatin film","volume":"16","author":"Zhang","year":"2008","journal-title":"Opt. Express"},{"key":"ref_85","doi-asserted-by":"crossref","first-page":"219","DOI":"10.1016\/j.snb.2010.09.018","article-title":"Optical microfibers decorated with PdAu nanoparticles for fast hydrogen sensing","volume":"151","author":"Escobar","year":"2010","journal-title":"Sens. Actuators B Chem."},{"key":"ref_86","doi-asserted-by":"crossref","unstructured":"Yao, B., Wu, Y., Gong, Y., and Rao, Y. (2012, January 14). A Highly Sensitive and Fast Response Molecular Sensor Based on Graphene Coated Microfiber. Beijing, China.","DOI":"10.1117\/12.975251"},{"key":"ref_87","doi-asserted-by":"crossref","first-page":"401","DOI":"10.1109\/LPT.2013.2239985","article-title":"H2 Sensing based on a Pd-coated tapered-FBG fabricated by DUV femtosecond laser technique","volume":"25","author":"Silva","year":"2013","journal-title":"IEEE Photonics Technol. Lett."},{"key":"ref_88","doi-asserted-by":"crossref","first-page":"562","DOI":"10.1002\/smll.200801165","article-title":"Laser emission from electrospun polymer nanofibers","volume":"5","author":"Camposeo","year":"2009","journal-title":"Small"},{"key":"ref_89","doi-asserted-by":"crossref","first-page":"143115","DOI":"10.1063\/1.2720262","article-title":"Electrospun dyedoped polymer nanofibers emitting in the near infrared","volume":"90","author":"Camposeo","year":"2007","journal-title":"Appl. Phys. Lett."},{"key":"ref_90","doi-asserted-by":"crossref","first-page":"5332","DOI":"10.1021\/nn100775v","article-title":"Light-emitting polymer single nanofibers via waveguiding excitation","volume":"4","author":"Gu","year":"2010","journal-title":"ACS Nano"},{"key":"ref_91","doi-asserted-by":"crossref","first-page":"4374","DOI":"10.1109\/JLT.2009.2024005","article-title":"Lasing action in dye doped polymer nanofiber knot resonator","volume":"27","author":"Song","year":"2009","journal-title":"J. Lightw. Technol."},{"key":"ref_92","doi-asserted-by":"crossref","first-page":"2757","DOI":"10.1021\/nl8012314","article-title":"Polymer single-nanowire optical sensors","volume":"8","author":"Gu","year":"2008","journal-title":"Nano Lett."},{"key":"ref_93","doi-asserted-by":"crossref","first-page":"495","DOI":"10.1002\/smll.200500432","article-title":"Electrospun polymer nanofibers as subwavelength optical waveguides incorporating quantum dots","volume":"2","author":"Liu","year":"2006","journal-title":"Small"},{"key":"ref_94","doi-asserted-by":"crossref","first-page":"113115","DOI":"10.1063\/1.2048808","article-title":"White-light emission of polyvinyl alcohol\/ZnO hybrid nanofibers prepared by electrospinning","volume":"87","author":"Sui","year":"2005","journal-title":"Appl. Phys. Lett."},{"key":"ref_95","doi-asserted-by":"crossref","first-page":"3650","DOI":"10.1002\/adfm.200700241","article-title":"Electrospinning: A facile method to disperse fluorescent quantum dots in nanofibers without F\u00f6rster resonance energy transfer","volume":"17","author":"Li","year":"2007","journal-title":"Adv. Funct. Mater."},{"key":"ref_96","doi-asserted-by":"crossref","first-page":"848","DOI":"10.1109\/LPT.2011.2138126","article-title":"Twisted optical microfibers for refractive index sensing","volume":"23","author":"Liao","year":"2011","journal-title":"IEEE Photonics Technol. Lett."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/14\/4\/5823\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T21:09:36Z","timestamp":1760216976000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/14\/4\/5823"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2014,3,25]]},"references-count":96,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2014,4]]}},"alternative-id":["s140405823"],"URL":"https:\/\/doi.org\/10.3390\/s140405823","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2014,3,25]]}}}