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1、AbstractInrecentyears,theartificialmetamaterialwithspecialelectromagnetic(EM)propertieswhichnotexistinnaturalmaterialshasattractedpeople’shighlyattentionanddevelopedvariousnovelapplications.Especiallybydesigningandregulatingthestructurecarefully,themicro/nanostructured
2、metamaterialcanraisethesurfaceplasmaeffect,thatrealizeuniqueopticalphenomenonwithterahertz(THz)andsolarEMwaves.Forexample,toachievethepolarizationconversionofTHzEMwaveandtheabsorptionofvisiblelightwithhighefficiencyandbroadbandinasmallvolume,themetamaterialwillhaveagoo
3、dapplicationprospectindetecting,communication,photo-thermal,photovoltaic,etc.However,theterahertzwavepolarizationconversionmetamaterialsarestillnarrowband,andPoorthermalconductivityrestrictedtheapplicationrangeofthevisiblelightabsorptionmetamaterials.Inthisarticle,wepr
4、oposeanovelpolarizationtransformationmetamaterialsthathaslonggradientleafshapemeta-surfacetorealizebroadbandlinearpolarizationconversionforTHzEMwaves,andanall-metalstructuredmetamaterialtorealizebroadbandandefficientlyabsorptionforvisiblelight,respectively.Themechanism
5、andperformanceofthemarealsostudied.Specificresearchcontentsandconclusionsareasfollows:Firstofall,tobreakthroughthelimitthattheπphasedifferenceofthereflectedelectricfieldcomponentsinorthogonaldirection,whichisoneofthenecessaryconditionstorealizeEMwavepolarizationconvers
6、ion,onlyariseinoneplasmonresonancebandofexistingmetematerials,wedesigneda“cut-line”typemetamaterialwithcirclearcshapelongedge.Thecirclearcshapelongedgecanregulatethefundamentalandthreetimesfrequencyplasmonresonancelinktogether,andmeetthebroadbandpolarizationconversionc
7、onditionspanningtworesonantband.Westudiedtheinfluencesofthelengthofmajorandminoraxis,thethicknessanddielectricconstantofmediumtothepolarizationconversionpropertiesofthemetamaterials,andanalyzedthemechanism.Theresultsshowthatwhenthedimensionofunitcellis260μm，thelengthof
8、majorandminoraxisis165μmand57μm,thethicknessofIII万方数据dielectriclayeris48μm,amorebroadbandoflinepolarizationtransforma
