简介:Photoelectricpropertyofpolyanilinedopedwithdodecyl-benzeneincreasesobviously,whenpolyanilinedopedwithDBSAisirradiatedwithlight,Mixtureofsensitivematerialisadvantageoustotheabsorptionofpolyanilineinvisiblelightspectrum,andtheconductivityisalsoimproved.TheresultsofdielectricmeasurementsonpolyanilinedopedwithDBSAinanAl-PAn-DBSA-Alconfigurationasfunctionoffrequencyandtemperaturearereported.Thespace-chargepolarizationphenomenonisobserved.Carrierlifetimeismicrosecondmagnitudeandmobilityis(0.001-0.1)cm^2/V·s,whichareobtainedbycalculationorexperiment.Theactiveenergyisobtainedfromtherelationbetweenconductivityandtemperature.TheconductingmechanismofPAn-DBSAisanalyzed.
简介:Weproposethatnanomaterialsareusedforfibers.Anovelnano-InPdopedfiberhasbeenfabricatedbythemethodofmodifiedchemicalvapordeposition(MCVD).Ithasbeenmeasuredthatthedopingconcentrationofphosphoruselementis0.1%.TherelationshipbetweenrefractiveindexandthewavelengthisobtainedbyfittingexperimentaldatatoSellmeierequation.Dispersionofthefiberhasbeencalculatedinthewavelengthrangeof1.2-1.6μm.Asthewavelengthvariesfrom1.20μmto1.60μm,dispersionparamete...
简介:Dopedmicro-crystallinesiliconfilmsaredepositedattemperaturesaslowas400℃bythecatalyticchemicalvapordepositionmethodusingasilaneandhydrogengasmixture.ElectricalpropertiessuchasthecarrierconcentrationandtheHallmobilityareinvestigatedforvariousmeasuringtemperatures.Itisfoundthatthegrainsofmicro-crystallinesiliconarepreferentiallyorientedalongthe(220)direction,andthattheHallmobilityislargerthan8cm^2·V^-1·s^-1,thecarrierconcentrationisabout1×10^17cm^-1-1×10^19cm^-3atroomtemperature.
简介:Theeffectsofthevariationsinfiberlength,fibermirrorreflectanceonefficiencyandoutputpowerareexperimentallyinvestigatedforerbium-dopeddoublepassbackwardsuperfluorescentfibersources(SFSs).Theinfluenceoffiberlengthonmeanwavelengthstability(MWS)hasalsobeendemonstrated.Byincorporatingashortsectionofun-pumpederbium-dopedfiber(EDF)attheoutputport,thepumppowerdependentonMWSbecomesindependentofpumpedEDFlength.Thisisanovelphenomenonthathasn'tbeenreporteduptonow,andshouldbehelpfultoSFSfabricationandtheoryanalysis.ByusingafiberMichelsoninterferometerasspectrumslicingcomponent,amulti-wavelengthfibersource(MWFS)with~20channels(from1542nmto1559nm)isgot.TheMWFShasachannelspacingof~0.8nmwhichsatisfiesITU-standard.Theintensityfluctuationamongchannelsislessthan0.5dB,andtheextinctionratioofallchannelsisabove14dB.ThiskindofMWFSshouldbeusefultowavelengthdivisionmultiplexingsystems.
简介:Wedemonstrateanelectric-controlledterahertz(THz)modulatorwhichcanbeusedtorealizeamplitudemodulationofterahertzwaveswithslightphoto-doping.TheTHzpulsetransmissionwasefficientlymodulatedbyelectricallycontrollingthemonolayersilicon-baseddevice.Themodulationdepthreached100%almostwhentheappliedvoltagewas7Vatanexternallaserintensityof0.6W/cm2.Thesaturationvoltagereducedwiththeincreaseofthephoto-excitedintensity.InaTHzcontinuouswave(CW)system,asignificantfallinbothTHztransmissionandreflectionwasalsoobservedwiththeincreaseofappliedvoltage.ThisreductionintheTHztransmissionandreflectionwasinducedbytheabsorptionforelectroninjection.Theresultsshowthatahigh-efficiencyandhighmodulationdepthbroadbandelectric-controlledterahertzmodulatorinapureSistructurehasbeenrealized.
简介:ThemethodtopumptheFBGwrittenintoanEr3+-dopedopticalfiberisproposedtoincreasethegroupvelocityofaprobingpulsebasedonthefactsthatpump-inducedprocesschangestherefractiveindexanddispersionassociatedwiththe4I15/2-4I13/2transitioninEr3+-dopedopticalfiber.Thesystemequationsarederived.Theeffectsofpumppoweranddopingconcentrationonthegroupvelocityarediscussed.
简介:Nitrogen-dopedamorphouscarbonthinfilmsaredepositedontheceramicsubstratescoatedwithTifilmbyusingdirectcurrentmagnetronsputteringtechniqueatN2andArgasmixtureatmosphereduringdeposition.Thefieldemissionpropertiesofthedepositedfilmshavebeeninvestigated.Thethresholdfieldaslowas5.93V/μmisobtainedandthemaximumcurrentdensityincreasesfrom4μA/cm2to20.67μA/cm2at10.67V/μmcomparingwithundopedamorphousfilm.Theresultsshowthatnitrogendopingplaysanimportantroleinfieldemissionofamorphouscarbonthinfilms.
简介:ThepreparationofPT/PEK-cfilmsisreportedaswellastheirdielectricandopticalproperties.Thec-axisorientationratioofthefilmsis68%.Dielectricconstantandlossfactorat10kHzisabout4.023F/mand0.003,respectively.Therefractiveindicesofthefilms,neandno,are1.6573and1.6278at0.63μmwavelength,respectively.Theopticalband-gapofthefilmwithathicknessof2.33μmisfoundtobe3.06eV
简介:Thedielectricpropertiesofceramicswithcompositionof(Sr1-xBix)TiO3+x/2(wherex=0.05~0.70)weremeasuredatfrequencyof1MHz.Theexperimentalresultsindicatethatthedielectricpropertiesof(Sr1-xBix)TiO3+x/2systemaregreatlyvariedwithanincreaseofthestoichiometricamountsofBi2O3.Therelativepermittivityofthesolidsolutionsishigh,andthedissipationfactorislow.Thepositronannihilationtechnique(PAT)wasadoptedtostudythedefectstructure.AnexplanationofthedielectricpropertiesofBi-dopedSrTiO3ceramicshasbeensuggestedintermsofelectron-compensationandvacancyordefect-compensationmechanismsandspace-chargepolarizationmechanism.
简介:一个方向联系了polarizer(DRP)在一个激光洞被使用消除空间洞在双向嗯做纤维戒指激光烧获得媒介。单个纵的模式的稳定的操作与可比较的紧张被完成为顺时针方向并且逆时针方向方向。在噪音上的30dB的一个敲击信号被观察。用作一个回转仪的这激光被表明,在敲击频率移动和洞旋转率之间的一种好线性关系被获得。CLC数字TN253
简介:做Fe的ZnO(Zn0.99Fe0.01O)粉末被球milling成功地与不同milling时间准备,并且用X光检查衍射(XRD)被调查,扫描电子显微镜(SEM),紫外可见(紫外力)光谱学,颤动的样品磁强计(VSM)和电子顺磁的回声(EPR)光谱学。用XRD的结构的分析表明在时间能在wurtzite,并且在XRD使结晶的不同milling的做Fe的ZnOmilled组织模式,与有XRD仪器的敏感的Fe簇有关的第二等的阶段不能被发现。为24h的样品milled的SEM图象显示出球形的nanoparticles的存在。从光分析,光乐队差距被发现与增加milling时间减少,它显示Fe2+离子的加入进ZnO格子。用VSM的磁化测量表明nanoparticles在房间温度展出铁磁性的行为,并且磁化与增加milling时间逐渐地增加。结论被nanoparticles的顺磁的回声在房间温度检验了的电子进一步证实,它显示出与Fe离子有关的一个强烈、宽广的铁磁性的回声信号。
简介:Aswitchableandtunableytterbium-dopedfiberringlaser(YDFL)isreportedanddemonstrated.EmployingaSagnacloopmirrorfabricatedbyan85-cm-longpolarization-maintainingfiber(PMF),theproposedYDFLcanoperatewithstabledual-wavelengthlasingortunablesingle-wavelengthlasingaround1064nm.Bothstabledual-wavelengthlasingandtunablesingle-wavelengthlasingareachievedbyadjustingapolarizationcontrollerintheSagnacloopmirror.Theexperimentalresultsshowthattheoutputoftheproposedfiberlaserwithtwodifferentoperationmodesisratherstableatroomtemperature.
简介:Nanocrystallineundoped和镍做了锌氧化物(Zn1?xNixO,x=0.00,0.01)粉末被简单、低温度的鈥渁u燃烧方法鈥成功地综合吗?微结构和光吸收和同样准备的样品的排放性质用X光检查衍射(XRD)被获得,扫描电子显微镜学(SEM),Fourier变换红外线的分光计(FTIR),紫外可见并且光致发光(PL)。没有任何第二等的阶段,结构学习在做Ni的样品证实六角形的wurtziteZnO的形成。光吸收大小在镍做之上在吸收乐队边显示红移动。乐队差距精力从3.21eV减少到3.17eV。在房间温度下面的同样准备的样品的光致发光系列出现强壮紫外(紫外)并且蓝排放山峰。PL排放研究强烈表明做的Ni能有效地调整在紫外区域在排放山峰导致红移动的精力水平。