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1、www.advopticalmat.dewww.MaterialsViews.comCOMMUNICATIONMetamaterial-BasedTwoDimensionalPlasmonicSubwavelengthStructuresOffertheBroadestWavebandLightHarvestingQiuqunLiang,TaishengWang,ZhenwuLu,QiangSun,YongqiFu,andWeixingYu*Metamaterials,whicharecomposedofmetallicanddielectricstateisurgentlyneededfo
2、ritsapplicationsinareasmentionedsubwavelengthstructuresarrangedinperiodicarray,areartiÞcialabove.Inthisletter,weproposeatwo-dimensional(2D)pyram-materialswiththepermittivityorpermeabilitylessthanthatofidalshapemetamaterial-basedabsorber.Incomparisonwithvacuumorwithnegativevaluesunattainableinnature
3、.[1Ð3]Duepreviousdesigns,thispyramidmetamaterialabsorberhasatotheiruniqueelectromagneticproperties,metamaterialshaveveryhighabsorptivityperformancethatispolarization-insensi-beenwidelyusedinmanyapplications,suchassensors,super-tive,wide-angleandomni-directionalatfullinfraredwaveband.lenses,miniatur
4、eantennas,andinvisiblecloaks.[4Ð7]Recently,Theproposedtwo-dimensionalpyramidabsorberiscom-metamaterial-basedperfectabsorbershavebeenattractedcon-posedofalternatingmetallicanddielectricthinÞlmsasshownsiderableattentionsandvarioustypesofterahertzmetamaterialintheinsetsofFigure1a.ThemetalthinÞlmismade
5、ofabsorbershavebeenreported.Forexample,Landyetal.pre-goldwiththicknesstm=10nm;dielectricthinÞlmismadesentedapolarization-insensitivemetamaterialabsorbercom-ofgermaniumwiththicknesstd=190nm.Thetotalnumberposedofmetallicsplitringresonatorsandcuttingwireswithofmetal/dielectricpairs(N)is15.Thesemultipl
6、ethinÞlmsinge-bandabsorption.[8]X.-J.Heetal.proposedadual-bandlayersarecarvedintoapyramidstructureforeachunitecell.metamaterialabsorbermadeoftwostackedmetalliccrossreso-Theperiodsoftheunitcellinbothxandydirectionsarenatorsandalowermetallicgroundplane,separatedbyanisola-1600nm.AgoldÞlmwithathickness
7、(t=100nm)isaddedtionmaterialspacer.[9]Cheng-WenChengpresentedwide-angleunderthepyramidmetamaterialabsorbertoblockanyincidentpolarizationindependentinfrareddualbandabsorbersbasedlighttransmission.Theoptimize
