简介：Core-shellstructurednanosphereswithmesoporoussilicashellandNicore(denotedasNi@meso-SiO2)arepreparedthroughathree-stepprocess.MonodispersedNiprecursorsarefirstprepared,andthencoatedwithmesoporousSiO2.FinalNi@meso-SiO2spheresareobtainedaftercalcination.TheproductsarecharacterizedbyX-raypowderdiffraction,transmissionelectronmicroscopyandN2adsorption-desorptionmethods.Thesesphereshaveahighsurfaceareaandarewelldispersedinwater,showingahighcatalyticactivitywithaTOFvalueof18.5,andoutstandingstabilityinhydrolyticdehydrogenationofammoniaboraneatroomtemperature.

简介：FortheBarievmodelwithsingleelectronhopping,pairpoppingandhardcorepotential,weprovetheintegrabilityofthismodelunderopenboundaryconditionsandobtainedtheBetheansatzequationsbyusingthereflectionequationsoftheopen-boundaryXXZmodel.

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简介：'Giant'CdSe/CdScore/shellnanocrystals(NCs)weresynthesizedwiththickCdSshell(15monolayers),andthex-raydiffraction(XRD)measurementindicatesthereisazincblendephaseinthethickCdSshell,whereasittransformedintowurtzitephaseunder5minradiationwitha400nm,594μJ∕cm2femtosecond(fs)laserbeam.TheevolutionoftheNCs’spontaneousemissionunderthefslaserradiationwasrecordedwithaHamamatsustreakcamera.Theas-synthesizedNCsexhibitanamplifiedspontaneousemission(ASE)at530nm,whichcomesfromabulk-likeCdSshellduetotheinterfacialpotentialbarrier,whichcouldslowdowntherelaxationofholesfromtheshelltothecore.Afterbeingannealedbyanfslaser,theASEoftheg-NCsistransferredfromabulk-likeCdSshelltoaquantum-confinedCdSecorebecausethephasetransformationdeterminedwiththeXRDmeasurementcouldremovetheinterfacialbarrier.BesidestheASEat643nm,twoshorter-wavelengthASEpeaksat589and541nm,correspondingtoopticaltransitionsofthesecond(1P)andthird(1D)electronquantizationshellsoftheCdSecore,alsoappear,thusindicatingthatAugerrecombinationiseffectivelysuppressed.

简介：吸收系列和折射索引变化在一个核心/壳量点为激子理论上被计算。我们的方法论的优点是一个人能由在监禁潜力改变二个参数调查排斥核心的影响。光吸收上的激子量点的维数效果被学习了。在一样的政体，激子的光吸收紧张比为二维的量戒指为核心/壳量点是小得多的，这被发现了。线性并且非线性的光吸收系数和折射索引变化与监禁潜力的变化被检验了。结果证明光吸收和折射索引变化被核心/壳量点的排斥核心强烈影响。而且，计算结果也表明作为内部半径增加，山峰系数和激子的折射索引变化将显示出的吸收珍视在核心/壳量点的光Aharonov-Bohm摆动。

简介：Coremodecutoffisausefulconceptnotonlyforataperedsingle-corefiber(SCF)butalsoforataperedmulticorefiber(MCF)torealizecladdingmodetransmission.Inthispaper,cut-offconditionsofeithercoremodefortaperedSCFsorsupermodesforMCFsaretheoreticallyinvestigated.RigorousanalyticalformulasarederivedforthemodesofSCFbyathree-layerwaveguidemodel,andanapproximationformulaofthecut-offconditionisgivenfortheLP01mode.ThesupermodesofMCFsareanalyzedbythecouplingmodetheory,andthecut-offconditioniscalculatedbyanumericalmethod.Simulationresultsshowthatthein-phasesupermodeofMCFshasasimilarcut-offconditionwiththatofSCF.Basedonthisproperty,aconvenientapproximateformulaisgiventoestimatethecut-offconditionofthein-phasesupermodefortaperedMCFs.

简介：Wereviewtheuseofhollow-corephotoniccrystalfibre(HC-PCF)forhighpowerlaserbeamdelivery.AcomparisonofbandgapHC-PCFwithKagome-latticeHC-PCFonthegeometry,guidancemechanism,andopticalpropertiesshowsthattheKagome-typeHC-PCFisanidealhostforhighpowerlaserbeamtransportationbecauseofitslargecoresize,lowattenuation,broadbandtransmission,single-modeguidance,lowdispersionandtheultra-lowopticaloverlapbetweenthecore-guidedmodesandthesilicacore-surround.ThepowerhandlingcapabilityofKagome-typeHC-PCFisfurtherexperimentallydemonstratedbymillijoulenanosecondlasersparkignitionand~100μJsub-picosecondlaserpulsetransportationandcompression.

简介：Wepresentapolarization-maintainingPANDAring-corefiber（PM-PRCF）characterizedbythecombinationofaring-corestructurewithtwostress-applyingrods.Thisspecialfiberdesignseparatestheadjacentmodesandavoidsthecutoffofthehigher-ordermodes,whichisacommonprobleminellipticalcorepolarization-maintainingfew-modefibers.Usingahigh-contrastindexringandstress-inducedbirefringence,thePM-PRCFfeaturessupportfor10vectormodes,witheffectiverefractiveindexseparationsfromtheiradjacentmodes>10-4.Broadbandperformanceisinvestigatedsubsequentlyoverawidewavelengthrangefrom1500to1630nm.Theproposedfiberistargetedatapplicationsinspace-divisionmultiplexingwhileeliminatingthecomplexmultiple-inputmultiple-outputsignalprocessing.

简介：Weproposeanddemonstrateataperedhollowannularcorefiber(HACF)couplerforexcitationofwhisperinggallerymodes(WGMs)ofanembeddedmicrosphereresonator.ThecouplerissimplyfabricatedbyfusionsplicingofasegmentofHACFwiththesingle-modefiber(SMF),andthenimprovedbytaperingthesplicingjointtoreducethecone-apexangle.Therefore,thecouplingefficiencyfromtheSMFtotheHACFisenhancedtoexcitevariousWGMsviaevanescentfieldcoupling.Normalpositive,negativesymmetricalLorentzianandasymmetricFanolineshapescanbeobtainedbyvaryingtheresonatorsizeandlocation.AnotherinterestingphenomenonisobservedthatahigherQ-factormodeinalowerQ-factormodehasacontrastashighas58.Temperaturesensingwithgoodstabilityisalsodemonstrated.ThisembeddedWGMmicrosphereresonatorinthetaperedHACFisexpectedtopromoteenvironmentaladaptabilityinpracticalapplicationsduetoitssimplicityandrobustness.

简介：Inthispaper,wepresentamode-selectivecouplerbasedonadual-coreall-solidphotonicbandgapfiber（AS-PBGF）.Becausetheyareall-solid,AS-PBGF-basedmodeconvertersareeasiertosplicetootherfibersthanthosebasedonair-holephotoniccrystalfibers.ModeconversionsbetweentheLP01andLP11modes,LP01andLP21modes,andLP01andLP02modesareobtainedatthewavelengthλ=1550nm.The3dBwavelengthbandwidthofthesemodeconvertersare47.8,20.3,and20.3nm,respectively.

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简介：Au-core/Pt-shellnanorods(Au@PtNR)被一个Au调停nanorod的生长方法准备了，并且他们在联合条件下面展出高电磁的地改进。由Au核心产生的高电磁的领域的远程的效果增加了，电磁的领域改进能被改变nanostructures的形态学控制。在这研究，我们用有限差别时间域(FDTD)在电磁的领域改进的模拟上报导结果方法，考虑Au@PtNR的真实形状。由于热点效果，电磁的领域能在磅nanodots之间是局部性的。电磁的领域改进被发现相当独立于磅内容，而本地粗糙和小锋利的特征力量显著地修改近地。当电磁的领域改进能被磅nanodots的分发在Au核心上调节，Au@PtNR能在相关区域发现潜在的应用。

简介：由量添加剂规则F的机械分析[F[f]]=F哪个的+[f],部分Fourier转变(FrFT)F[f]应该满足，我们表明相互转变的操作员是的位置动量为构造FrFT的集成内核的核心元素。基于这观察并且二互相结合纠缠状态的代表，我们然后为启用复杂部分Fourier转变(CFrFT)导出一个核心操作员，它也服从添加剂规则。以一种类似的方式，我们也为夫累Ｘ尔操作员的一种类型揭示部分转变性质。

简介：Thermodynamicpropertiesandphasediagramsofamixedspin-(1,2)Isingferrimagneticsystemwithsingleionanisotropyonhexagonalnanowirearestudiedbyusingeffective-fieldtheorywithcorrelations.Thesusceptibility,internalenergyandspecificheatofthesystemarenumericallyexaminedandsomeinterestingphenomenainthesequantitiesarefound.TheeffectoftheHamiltonianparametersonphasediagramsareexaminedindetail.Besidessecond-orderphasetransition,linesoffirst-ordertransitionandtricriticalpointsarefound.Inparticular,wefoundthatforsomenegativevaluesofsingle-ionanisotropies,thereexistfirst-orderphasetransitions.

简介：Understandingbendlossinsingle-ringhollow-corephotoniccrystalfibers(PCFs)isbecomingofincreasingimportanceasthefibersenterpracticalapplications.Whilepurelynumericalapproachesareuseful,thereisaneedforasimpleranalyticalformalismthatprovidesphysicalinsightandcanbedirectlyusedinthedesignofPCFswithlowbendloss.Weshowtheoreticallyandexperimentallythatawavelength-dependentcriticalbendradiusexistsbelowwhichthebendlossreachesamaximum,andthatthiscanbecalculatedfromthestructuralparametersofafiberusingasimpleanalyticalformula.Thisallowsstraightforwarddesignofsingle-ringPCFsthatarebend-insensitiveforspecifiedrangesofbendradiusandwavelength.Italsocanbeusedtoderiveanexpressionforthebendradiusthatyieldsoptimalhigher-ordermodesuppressionforagivenfiberstructure.

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简介：Fiber-opticlaser–ultrasoundgenerationisbeingusedinanincreasingnumberofapplications,includingmedicaldiagnosis,materialcharacterization,andstructuralhealthmonitoring.However,mostcurrentlyusedfiber-opticultrasonictransducersalloweffectiveultrasoundgenerationatonlyasinglelocation,namely,atthefibertip,althoughtherehavebeenafewlimitedproposalsforachievingmultipointultrasoundgenerationalongthelengthofafiber.Herewepresentanovelfiber-opticultrasoundtransducerthatusesthecore-offsetsplicingoffiberstoeffectivelygenerateultrasoundatmultiplelocationsalongthefiber.Theproposedlaser–ultrasonictransducercanproduceabalancedstrengthsignalbetweenultrasonicgenerationpointsbyreasonablycontrollingtheoffsetsofthefibers.Theproposedtransducerhasotheroutstandingcharacteristics,includingsimplefabricationandlowcost.

简介：Weproposeanovelwaveguidedesignofpolarization-maintainingfewmodefiber（PM-FMF）supporting≥10non-degeneratemodes,utilizingacentralcircularairholeandacircumjacentelliptical-ringcore.Thestructureendowsanewdegreeoffreedomtoadjustthebirefringenceofalltheguidedmodes,includingthefundamentalpolarizationmode.Numericalsimulationsdemonstratethat,byoptimizingtheairholeandelliptical-ringcore,aPM-FMFsupporting10distinctivepolarizationmodeshasbeenachieved,andtheeffectiveindexdifferenceΔneffbetweentheadjacentguidedmodescouldbekeptlargerthan1.32×10-4overthewholeC+Lband.TheproposedfiberstructurecanflexiblytailoredtosupportanevenlargernumberofmodesinPM-FMF（14-modePM-FMFhasbeendemonstratedasanexample）,whichcanbereadilyapplicabletoascalablemodedivisionmultiplexingsystem.

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