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1、ARTICLESPUBLISHEDONLINE:8JUNE2015
2、DOI:10.1038/NPHOTON.2015.94Flyingparticlesensorsinhollow-corephotoniccrystalfibreD.S.Bykov*,O.A.Schmidt,T.G.Euser*andP.St.J.RussellOpticalfibresensorsmakeuseofdiversephysicaleffectstomeasureparameterssuchasstrain,temperatureandelectricfield.Hereweintroducea
3、newclassofreconfigurablefibresensor,basedona‘flying-particle’opticallytrappedinsideahollow-corephotoniccrystalfibreandillustrateitsuseinelectricfieldandtemperaturesensingwithhighspatialresolution.Theelectricfielddistributionnearthesurfaceofamulti-elementelectrodeismeasuredwitharesolutionof∼100
4、μmbymonitoringchangesinthetransmittedlightsignalduetothetransversedisplacementofachargedsilicamicroparticletrappedwithinthehollowcore.Doppler-basedvelocitymeasurementsareusedtomapthegasviscosity,andthusthetemperature,alongahollow-corephotoniccrystalfibre.Theflying-particleapproachrepresent
5、sanewparadigminfibresensors,potentiallyallowingmultiplephysicalquantitiestobemappedwithhighpositionalaccuracyoverkilometre-scaledistances.heirflexibility,compactnessandimmunitytounwantedAmicroparticleisfirstlaunchedintotheHC-PCF(Fig.1a),andelectromagneticinterferencehasmadefibre-opticsensors
6、baseditspositioniscontrolledbyadjustingthepowerinthecounter-Tonconventionalstep-indexfibresattractiveinmanycontexts1.propagatingopticalmodes(seeMethods).OnceinthedetectionFibreBragggratingsareroutinelyusedtomonitorchangesinstrainzone,itsinteractionwiththeenvironmentisremotelyprobedbyortem
7、perature2–5andifthefibreiscoatedwithmagnetostrictivemonitoringthetransmittedandreflectedlight.Severaldifferentmaterials,magneticfieldscanbesensed5,6.Thelinearandnonlinearsensingschemesarepossible.Ifforexamplethewholefibreisopticalpropertiesoftheglasscorehavebeenusedtomeasuretemp-subjecttotra
8、nsversemechanicalvibrationorlinearacceleration,erature1,3andmagneticfield7–9,andradiation-inducedphoto-theparticlewillbeperturbedfromitstrappedposition,causingadarkeningorluminescenceisusedinradiationdosimetry10.changeinthetransmittedopticalsignal(Fig.1b).IftheparticleSyst