简介：Thispaperanalysestheinfluenceofcertainparametersandfactorsonthecharacteristicsoftheelectropneumaticloudspeakeranddescribestheexperimentalworkcarriedout.Thedevelopedportableelectropneumaticloudspeakerpossessesgoodpropertieswithaflatfrequencyresponsefrom400Hzto2kHzandamaximumsoundpressrueoutputof120dBatadistance2metreonaxisfromthehornmouth.Themagneticfluxdensityatthemagneticgapis19,000gauss.Theelectropneumaticloudspeakerissmallinsizeandlightweight.

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简介：Thefinite-differencetime-domainmethodwasemployedtocalculatelightextractionefficiencyofthin-filmflip-chipInGaN/GaNquantumwelllight-emittingdiodes（LEDs）withTiO2microspherearrays.TheextractionefficiencyforLEDswithmicrospherearrayswasinvestigatedbyfocusingontheeffectofthepackingdensity,packingconfiguration,anddiameter-to-periodratio.Thecomparisonstudiesrevealedtheimportanceofhavingahexagonalandclose-packedmonolayermicrospherearrayconfigurationforachievingoptimumextractionefficiency,whichtranslatedintoa3.6-foldenhancementinlightextractioncomparedtothatforaplanarLED.ThisimprovementisattributedtothereducedFresnelreflectionandenlargedlightescapecone.Theengineeringofthefar-fieldradiationpatternswasalsodemonstratedbytuningthepackingdensityandpackingconfigurationofthemicrospherearrays.

简介：Anall-opticallight–control–lightfunctionalitywiththestructureofamicrofiberknotresonator(MKR)coatedwithtindisulfide(SnS2)nanosheetsisexperimentallydemonstrated.TheevanescentlightintheMKR[witharesonanceQof~59,000andanextinctionratio(ER)of~26dB]isexploitedtoenhancelight–matterinteractionbycoatingatwo-dimensionalmaterialSnS2nanosheetontoit.Thankstotheenhancedlight–matterinteractionandthestrongabsorptionpropertyofSnS2,thetransmittedopticalpowercanbetunedquasi-linearlywithanexternalvioletpumplightpower,whereatransmittedopticalpowervariationrateΔTwithrespecttothevioletlightpowerof~0.22dB∕mWisobtained.Inaddition,theMKRstructurepossessingmultipleresonancesenablesadirectexperimentaldemonstrationoftherelationshipbetweenresonanceproperties(suchasQandER),andtheobtainedΔTvariationratewithrespecttothevioletlightpower.ItverifiesexperimentallythatahigherresonanceQandalargerERcanleadtoahigherΔTvariationrate.Intermsoftheoperatingspeed,thisdevicerunsasfastas~3.2ms.Thiskindofall-opticallight–control–lightfunctionalstructuremayfindapplicationsinfutureall-opticalcircuitry,handheldfibersensors,etc.

简介：Thisreviewcoverstheprogressoflightscatteringapplicationsinthefieldofparticlecharacterizationinthepastdecade.Thereviewaddressesstaticlightscattering(themeasurementofscatteringintensitiesduetolight-particleinteractionatvariousspatiallocations),dynamiclightscattering(themeasurementofscatteringduetolight-particleinteractionasafunctionoftime),andscatteringtrackinganalysis(thetrackingofparticlemovementthroughscatteringmeasurement).

简介：Wemeasuretheelectromagneticdegreeoftemporalcoherenceandtheassociatedcoherencetimeforquasi-monochromaticunpolarizedlightbeamsemittedbyanLED,afilteredhalogenlamp,andamultimodeHe–Nelaser.ThemethodisbasedonobservingattheoutputofaMichelsoninterferometerthevisibilities(contrasts)oftheintensityandpolarization-statemodulationsexpressedintermsoftheStokesparameters.Theresultsareingoodagreementwiththosededuceddirectlyfromthesourcespectra.Themeasurementsarerepeatedafterpassingthebeamsthroughalinearpolarizersoastoelucidatetheroleofpolarizationinelectromagneticcoherence.Whilethepolarizervariestheequal-timedegreeofcoherenceconsistentlywiththetheoreticalpredictionsandalterstheinnerstructureofthecoherencematrix,thecoherencetimeremainsalmostunchangedwhenthelightvariesfromunpolarizedtopolarized.Theresultsareimportantintheareasofapplicationsdealingwithphysicalopticsandelectromagneticinterference.

简介：Ashortoverviewofthetheoryofaccelerationofthinfoilsdrivenbytheradiationpressureofsuperintenselasersispresented.Asimplecriterionforradiationpressuredominanceatintensitiesaround5×1020Wcm-2isgiven,andthepossibilityforfastenergygainintherelativisticregimeisdiscussed.

简介：Spurredonbytheinventionofthebluelight-emittingdiode(LED)aquarterofacenturyago,theLEDindustryhasadvanceddramaticallyandhasrevolutionizedthesignaling/signage,mobileandflatpaneldisplay,andmorerecently,generallightingmarkets.Indeed,LEDsnowout-surpassinperformanceallconventional(e.g.,incandescent,fluorescent,high-intensitydischarge)lightsourcesingeneralilluminationapplications.Thequestionarises:whatmoreistobedone?ThuscomesthethesisforthisspecialissueonLEDsandapplications.Fromthecontributedarticles,welearnthatLEDtechnologycontinuestoevolveandtransformitselfnotonlywithintheexistingapplicationsbutisalsopositioningforbrandnewapplicationstocome,bothofwhicharehighlightedhere.

简介：ＳｔｒｕｃｔｕｒｅＰｒｏｐｅｒｔｉｅｓｏｆＬｉｇｈｔＮｅｕｔｒｏｎ－ｒｉｃｈＮｕｃｌｅｉ￥ＧｕＪｉｎｎａｎａｎｄＺｈａｎｇＣｈａｎｇｈｕａＩｎｔｉｌｅｆｒａｍｅｗｏｒｋｏｆｌａｒｇｅ－ｂａｓｉｓｓｈｅｌｌｍｏｄｅｌ［１］，ｔｈｅｓｔｒｕｃｔ...

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简介：Inthispaper,animagedynamiclightscatteringmethodfornanoparticlesizingisintroduced.ThespatialdistributionofthescatteredlightsfromnanoparticlesundergoingBrownianmotionwascapturedatahighframeratebyadigitalcamerawithinonesecond,whichisconsiderablyfasterthantheconventionalphotoncorrelationspectroscopymethod.Thecapturedseriesofphotographsweremeshedintothousandsofsmallunitsforcalculatingtheintensityautocorrelationfunctionsinparallel.Experimentalresultsfromthemeasurementsofthreereferencenanoparticlesamples(27,80,and352nmindiameters)demonstratedthefeasibilityofthismethod.

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简介：Onthebasesofhightemperaturecreepexperiments,theresearchonengineeringapplicationofrheologicalformingiscarriedoutontwokindsoflightmetalalloypartsnamedcylindricalshellofLc4aluminumalloyandvanediskwithcomplexcurvedsurfaceofTC11titaniumalloy.Moreover,themechanicalpropertytestsunderroomandhightemperaturesfortheworkpiecesproducedbythisnewtechniquearealsodone,theresultsshowedthattheyaremuchimprovedevidentlycomparedwiththoseproducedbytraditionalmethod.

简介：一年一度的光学国际学术大会LightConference将于2017年7月16日至18日在长春召开。此次盛会由中国科学院长春光学精密机械与物理研究所和UniversityofRochester,USA（美国罗切斯特大学）联合主办,Light：Science＆Applications编辑部承办,科技部曹健林研究员、UniversityofRochester郭春雷教授、基金委秦玉文教授、UCLAAydoganOzcan教授担任大会共主席。

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简介：Weinvestigatethedynamiccrystallizationprocessesofcolloidalphotoniccrystals,whicharepotentiallyinvaluableforsolvinganumberofexistingandemergingtechnicalproblemsinregardstocontrolledfabricationofcrystals,suchassizenormalization,stabilityimprovement,andaccelerationofsynthesis.Inthispaper,wereportsystematichigh-resolutionopticalobservationofthespontaneouscrystallizationofmonodispersepolystyrene(PS)micro-spheresinaqueoussolutionintoclose-packedarraysinastaticlineopticaltweezers.Theexperimentsdemonstratethatthecrystalstructureismainlyaffectedbytheminimumpotentialenergyofthesystem;however,thecrystallizationdynamicscouldbeaffectedbyvariousmechanical,physical,andgeometricfactors.Thecomplicateddynamictransformationprocessfrom1Dcrystallizationto2Dcrystallizationandthecreationandannihilationofdislocationsanddefectsviacrystalrelaxationareclearlyillustrated.Twomajorcrystalgrowthmodes,theepitaxygrowthpatternandtheinsertedgrowthpattern,havebeenidentifiedtoplayakeyroleinshapingthedynamicsofthe1Dand2Dcrystallizationprocess.Theseobservationsofferinvaluableinsightsforin-depthresearchaboutcolloidalcrystalcrystallization.

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简介：Thispaperderivestheforceoftheelectromagneticradiationonleft-handedmaterials(LHMs)byadirectapplica-tionoftheLorentzlawofclassicalelectrodynamics.TheexpressionsofradiationforcearegivenforTE-polarisedandTM-polarisedfields.Thenumericalresultsdemonstratethatelectromagneticwavesexertaninverselateralradiationforceoneachedgeofthebeams,thatis,thelateralpressureisexpansiveforTE-polarisedbeamsandcompressiveforTM-polarisedbeams.TheinvestigationoftheradiationforcewillprovideinsightsintothefundamentalpropertiesofLHMsandwillprovidetobetterunderstandingoftheinteractionoflightwithLHMs.

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