简介：Wereportsingle-shotdamagethresholdasafunctionofpulseduration(50-900fs)forMgF2/ZnS800-nmomnidirectional-reflectionfilm,interferencefilter,andgoldfilm.Theresultsindicatethatthedamagewithultrashortpulseisnonthermal,whichisdifferentfromthatwithlongpulse.Additionally,theablationcraterdepthsof45°high-reflectionfilmandinterferencefilterarepresented.Alogarithmicrelationbetweentheablationdepthandpulsefluence,whichissimilartothatoftransparentmaterials,isfound.

简介：Wetheoreticallyinvestigatetheclassicalanalogofelectromagneticallyinducedtransparency(EIT)andelectromagneticallyinducedabsorption(EIA)inaplanarmetamaterialatopticalfrequency,whichoriginatesfromdestructiveandconstructiveinterferencebetweendarkandradiativeelements.Themetamaterialconsistsoftwocoupledresonatorswithdifferentgeometries.AnEIT-liketransparentwindowwithlowabsorptionisobservedandfoundtobestronglya?ectedbyresonantstatesoftheresonators.ThetransitionbetweentheEITandEIAisachievedbychangingthesplitwidthandcouplingdistance.Theabsorptionisenhancedupto2.5timescomparedwiththedipolarcase.TheexcitationofthedarkmodeisveryimportantforEIT-andEIA-likeresponsesoftheproposedmetamaterial.TheEITandEIAphenomenao?erapotentialmethodformanipulatingelectromagneticresponseinmetamaterial-baseddevices.

简介：Theinfluenceofairturbulenceonthetransversewanderingofasinglefemtosecondlaserfilamentisstudiedbynumericalsimulation.Theresultsshowthattheaveragetransversedisplacementofthesinglefilament(δr}isproportionaltothesquarerootofturbulentstructureconstantandtherelationsbetweenandthepropagationdistancecanbefitbyapowerfunction.Inaddition,byusinganaxiconasafocusingoptics,thewanderingofasinglefilamentissuggestedtobestrongerthanthefree-propagationcase.

简介：Theeffectofannealingconditiononsputteredindiumtinoxide(ITO)filmsonquartzwiththethicknessof200nmischaracterizedtoshowenhancedopticaltransparencyandoptimizedelectricalcontactresistivity.Theas-depositedgrownITOfilmexhibitsonly65%and80%transmittanceat532and632.8nm,respectively.Afterannealingat475°Cfor15min,theITOfilmisrefinedtoshowimprovedtransmittanceatshorterwavelengthregion.Thetransmittancesof88.1%at532nmand90.4%at632.8nmcanbeobtained.The325-nmtransmittanceofthepost-annealedITOfilmisgreatlyincreasedfrom12.7%to41.9%.Optimizedelectricalpropertycanbeobtainedwhenannealingbelow450°C,leadingtoaminimumsheetresistanceof26Ω/square.SuchanITOfilmwithenhancedultraviolet(UV)transmittancehasbecomeanalternativecandidateforapplicationsincurrentUVphotonicdevices.Themorphologyandconductanceoftheas-depositedandannealedITOfilmsaredeterminedbyusinganatomicforcemicroscopy(AFM),showingagreatchangeontheuniformitydistributionwithfiniteimprovementonthesurfaceconductanceoftheITOfilmafterannealing.

简介：Siliconnanoconearrayswithmetalsilicide(FeandCr)-enrichedapexesarefabricatedonSi(100)substratebytheAr+ionbombardmentmethod.Thenanoconearraysshowexcellentfieldemissionproperties.Ahighcurrentdensity(J)of～0.33mA/cm2underafieldof～3V/μm,averylowturn-onfieldof～1.4V/μm,andaverylargeenhancementfactorof～9466arealsoobtained.TheemissionJofSinanoconearraysremainsextremelystableforlongperiodsoftime(24h).

简介：Micro-depositionofanaluminumfilmof500-nmthicknessonaquartzsubstratewasdemonstratedbylaser-inducedforwardtransfer(LIFT)usingafemtosecondlaserpulse.Withthehelpofatomicforcemicroscopy(AFM)andscanningelectronmicroscopy(SEM),thedependenceofthemorphologyofdepositedaluminumfilmontheirradiatedlaserpulseenergywasinvestigated.Asthelaserfluencewasslightlyabovethethresholdfluence,thehigherpressureofplasmaforthethickerfilmmadethefreesurfaceofsolidphaseburstout,whichresultedinthatnotonlythesolidmaterialwassputteredbutalsothedepositedfilmintheliquidstatewasmadeirregularly.

简介：Wereportontheexperimentalobservationoftheairflowmotioninducedbyan800nm,1kHzfemtosecondfilamentinacloudchamberfilledwithairandhelium.Itisfoundthatvortexpairswithoppositerotationdirectionsalwaysformbothbelowandabovethefilaments.WedonotobservethatthevorticesclearlyformedabovethefilamentinairjustbecauseoftheformationofsmallerparticleswithweakerMiescattering.Simulationsoftheairflowmotioninheliumareconductedbyusingthelaserfilamentasaheatsource,andthesimulatedpatternofvorticesandairflowvelocityagreewellwiththeexperimentalresults.更多还原

简介：Theopticalpropertiesofafive-levelatomicsystemcomposedofaA-typefour-levelatomicandatripodfour-levelatomicsystemsareinvestigated.Itisfoundthatthebehaviorsofelectromagneticallyinducedtransparency(EIT)andgroupvelocitycanbecontrolledbychoosingappropriateparameterswiththeinteractingdarkresonances.Inparticular,whenallthefieldsareonresonance,theslowlightatthesymmetrictransparencywindowswithamuchbroaderEITwidthisobtainedbytuningtheintensityofthecouplingfieldincomparisonwithitssub-system,whichprovidespotentialapplicationsinquantumstorageandretrievaloflight.

简介：Thetunablemultipleplasmon-inducedtransparency(PIT)effectisinvestigatednumericallyinametal-insulator-metal(MIM)waveguidewiththreeside-coupledrectangularresonators.Thesystemexhibitsdual-modePITeffectsinthevisibleandnear-infraredregions.Byadjustingthegeometricalparametersofthestructure,wecanmanipulatenotonlyeachsinglePITwindow,butalsothedoublePITwindowssimultaneously.Ourstructuresmayhavepotentialapplicationsforopticalcommunication,integratedoptics,andopticalinformationprocessing.Thefiniteelementmethod(FEM)illustratesourtheoreticaldesign.

简介：Influenceofthermal-mechanicalpropertiesonthefeaturesofthepandapolarization-maintainingopticalfiber(PMF)infabricationprocessisstudiedindetailbyfiniteelementmethod(FEM).Thestressbirefringenceis2.13443×10-4obtainedbythestaticanalysisand2.1269×10-4bydynamicanalysis.Thedifferenceinsimulationbytwomethodsisaround0.4%.Thenon-uniformityofstressbirefringenceinthefibercoreisabout1.6%.Predictedresultsdemonstratethateffectofthethermalconductiveparameteronfiberthermalstressdominates.Thehighanduniformstressbirefringenceinthefibercoreisobtainedbyappropriatelyselectingsuitablestressregionareaandposition.

简介：Bystudyingthethermal-inducedphaseshiftmechanismofaninterferometricfiber-opticgyroscope(IFOG)sensingcoil,anovelgeneralizedexpressionbasedonathree-dimensional(3D)modelisproposed.ComparedwiththetraditionalpureShupeeffectmodel,thesimulationresultsshowthatthenew3Dmodel,includingelasticstrainandtheelasto-opticaleffect,candescribethethermaleffectofthecoilsmoreaccurately.Experimentswithtemperaturechangeratesbetween-40°Cand70°Careperformedtoverifytheeffectivenessoftheproposedgeneralizedexpression.Theresultsofourworkcanguideresearchersinidentifyingcountermeasurestoreducethethermal-inducedbiaserrorinIFOG.

简介：Anopticallyactivatedopticalswitchbasedonsuppressionofmodeinterference(SMI)ispresented.Theimagingpropertiesofmulti-modeinterference(MMI)sectionintheswitchwithY-branchcanbemodifiedbyacontrollinglightinjection.Theswitchwassimulatedbyfinitedifferencebeampropagationmethod(FD-BPM)andfabricatedonGaAlAs/GaAsepitaxialmaterials.Atthewavelengthof1.31μm,theprimaryexperimentshowedanextinctionratioofabout8dBwithcontrollinglightpowerdensityof73.5W/mm2.

简介：ThisLetterreportstheformationofperiodicsurfacestructuresonNi–Fefilmirradiatedbyasinglefemtosecondlaserpulse.Aconcavelenswithafocuslengthof-150mmisplacedinfrontofanobjective(100×,NA=0.9),whichtransformstheGaussianlaserfieldintoaringdistributionbytheFresneldiffraction.Periodicripplesformontheablationareaaftertheirradiationofasinglefemtosecondlaserpulse,whichdependsonthelaserpolarizationandlaserfluence.Weproposethattheringstructureofthelaserfieldleadstoasimilartransientdistributionofthepermittivityonthesamplesurface,whichfurtherlaunchesthesurfaceplasmonpolaritons.Theinteractionoftheincidentlaserwithsurfaceplasmonpolaritonsdominatestheformationofperiodicsurfacestructures.

简介：Pockel’seffectandopticalrectificationinducedbythebuilt-inelectricfieldinthespacechargeregionofasiliconsurfacelayeraredemonstratedina{001}-cuthigh-resistancesiliconcrystal.Thehalf-wavevoltageisabout203V,deducedbyPockel’seffect.TheratioX2zxxX2zzziscalculatedtobeabout0.942accordingtoopticalrectification.OurcomparisonwiththeKerrsignalshowsthatPockel’ssignalismuchstronger.Thisindicatesthattheseeffectsaresoconsiderablethattheyshouldbetakenintoaccountwhendesigningsilicon-basedphotonicdevices.

简介：Atheoreticalinvestigationiscarriedoutintothecrossphasemodulation(XPM)inanasymmetricdoubleAlGaAs/GaAsquantumwellsstructurewithacommoncontinuum.Itisfoundthat,combiningresonanttunneling-inducedtransparencyandconstructiveinterferenceinthethird-orderKerreffect,agiantXPMcanbeachievedwithvanishinglinearandnonlinearabsorptions,accompaniedbythevelocitiesoftheprobeandsignalfieldsbeingmatched.Furthermore,thisgiantXPMcouldinduceaπ-phaseshiftatasingle-photonlevelwhichisfavorablefortheapplicationsintwo-qubitquantumlogicgates.

简介：Theeffectsofvacuum-inducedcoherence(VIC)onthepropertiesoftheabsorptionandgainoftheprobefieldinanequispacedthree-levelladderatomicsystemareinvestigated.Itisfoundthatlasingwithoutinversion(LWI)isremarkablyenhancedduetotheeffectofVICinthecaseofthesmallincoherentpumprate.

简介：Measurementsoftheexcitationpower-dependenceandtemperature-dependencephotoluminescence(PL)areperformedtoinvestigatetheemissionmechanismsofInGaN/GaNquantumwells(QWs)inlaserdiodestructures.ThePLspectralpeakisblueshiftedwithincreasingtemperatureoveracertaintemperaturerange.ItisfoundthattheblueshiftrangewaslargerwhenthePLexcitationpowerissmaller.ThisparticularbehaviorindicatesthatcarriersarethermallyactivatedfromlocalizedstatesandpartiallyscreenthepiezoelectricfieldpresentintheQWs.Thesmallblueshiftrangecorrespondstoaweakquantum-confinedStarkeffect(QCSE)andarelativelyhighinternalquantumefficiency(IQE)oftheQWs.