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1、中国科技论文在线http://www.paper.edu.cnControlofOpticalLimitingPropertyofGraphene#DispersionsbyTuningSolventTemperature*5LiheYan,HuanhuanXu(ShaanxiKeyLabofInformationPhotonicTechnique,SchooloftheElectronicandInformationEngineering,Xi’anJiaotongUniversity,Xi'an710049)Ab
2、stract:Theopticallimiting(OL)propertiesofgraphenedispersionsinchlorobenzene(CB)andN-methy1-2-pyrrolidinone(NMP)werestudiedusingananosecondlaser.Bymeasuringthenonlinear10scattering(NLS)light,wedemonstratedthatNLSeffectoriginatingfromlaserinducedsolventmicro-bubb
3、lesand/ormicro-plasmasplayedanimportantroleinOLprocessofgraphenedispersions.Bychangingthesolventtemperature,theOLabilityofgraphenedispersionwasabletobecontrolled.TheinfluenceoftemperatureontheOLpropertyofthematerialswasattributedtothesurfacetensionchangeofsolve
4、nts,whichwasresponsibletotheNLSintheOLprocessofthedispersions.15Keywords:opticallimiting,graphene,nonlinearoptics0IntroductionAsarepresentativecarbonnanomaterial,graphenehasattractedsignificantresearchinterest[1-2]owingtoitsremarkablemechanical,thermal,electric
5、alandopticalproperties,thatis,high20thermalconductivity,carriermobility,andthird-ordernonlinearpolarizability.Theemergenceof[3]graphenemotivatesthedesignandfabricationofnanoscaleoptoelectronicandphotonicdevices.Opticallimiterisaneffectiveprotectiondeviceforopti
6、calsensorsandhumaneyesfromintenselaserbeams,whichhashugeapplicationpotentialformilitary.Anidealopticallimitershouldstronglyattenuateintense,potentiallydangerouslaserbeams,whileexhibitinghightransmittance[4-5]25forlowintensityambientlight.Alongwithopticallimitin
7、g(OL)studiesonfullerenesand[6-7]carbonnanotubes,theOLpropertiesofgraphenehavemadegreatprogressesoveradecade.TheexperimentalresultsindicatethatthegraphenedispersionsdisplayexcellentOLbehavioroverabroadwavelengthrangefromthevisibletothenear-infrared,resultingfrom
8、nonlinearscattering[8-9](NLS)bylaser-inducedmicrobubblesandmicroplamases.30ThethermallyinducedNLSisconsideredastheprinciplemechanismforOL.AccordingtotheMiescatteringtheory,t
