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1、Letterpubs.acs.org/NanoLettUltrabroadbandPhotonicStructuresToAchieveHigh-PerformanceDaytimeRadiativeCooling,†,§,†,§,‡EdenRephaeli,*AaswathRaman,*andShanhuiFan*†‡DepartmentofAppliedPhysicsandDepartmentofElectricalEngineering,StanfordUniversity,Stanford,Califor
2、nia94305,UnitedStatesABSTRACT:Ifproperlydesigned,terrestrialstructurescanpassivelycoolthemselvesthroughradiativeemissionofheattoouterspace.Forthefirsttime,wepresentametal-dielectricphotonicstructurecapableofradiativecoolingindaytimeoutdoorconditions.Thestructu
3、rebehavesasabroadbandmirrorforsolarlight,whilesimultaneouslyemittingstronglyinthemid-IRwithintheatmospherictransparencywindow,achievinganetcoolingpowerinexcessof100W/m2atambienttemperature.Thiscoolingpersistsinthepresenceofsignificantconvective/conductiveheate
4、xchangeandnonidealatmosphericconditions.KEYWORDS:Radiativecooling,thermalradiation,broadbandsolarmirror,phonon-polariton,selectiveemissionTheEarth’satmospherehasatransparencywindowforBuildinguponthesedevelopments,inthisLetterwepresentelectromagneticwavesbetwe
5、en8−13μmthatcoincidesforthefirsttimeasinglecompactplanardevicecapableofwithpeakthermalradiationwavelengthsattypicalambientachievingsubstantialradiativecoolinginthedaytime.Wealsotemperatures.Byexploitingthiswindowonecancoolabodypresentatheoreticalandnumericalan
6、alysisidentifyingtheontheEarth’ssurfacebyradiatingitsheatawayintocoldoutercriticalperformancemetrictargetsneededtoaccomplishspace.Thisradiativecoolingmechanismisattractivetoenergydaytimeradiativecooling.Ourdesignforadaytimeradiativeefficiencyimprovementeffortsbe
7、causeitprovidesapurelycooler,showninFigure1a,representsastrongdeparturefrompassivecoolingstrategyforterrestrialstructureswithoutthepreviouslypublishedsystems.Ratherthandesigningacoverfoilneedforanyenergyinputs.thatisspatiallyseparatedfromablackemitterweintrod
8、uceanWhilenighttimeradiativecoolinghasbeenextensively1−7integratedthermallyselectiveemitteratopabroadbandmirror.studied,thepeakdemandforcoolingoccursduringtheDoingsoenablesustoexploitnear
