[2007] Optical cloaking with metamaterials

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1、Blackplate(224,1)LETTERSOpticalcloakingwithmetamaterialsWENSHANCAI,UDAYK.CHETTIAR,ALEXANDERV.KILDISHEVANDVLADIMIRM.SHALAEV*SchoolofElectricalandComputerEngineeringandBirckNanotechnologyCenter,PurdueUniversity,WestLafayette,Indiana47907,USA*e-mail:shala

2、ev@purdue.eduPublishedonline:2April2007;doi:10.1038/nphoton.2007.28ArtificiallystructuredmetamaterialshaveenabledunprecedentedIncontrasttothereporteddesignofamicrowavecloakwithTEflexibilityinmanipulatingelectromagneticwavesandproducingpolarization7,wefoc

3、usontransversemagnetic(TM)incidence,newfunctionalities,includingthecloakofinvisibilitybasedwiththemagneticfieldpolarizedalongthez-axis.Inthiscaseoncoordinatetransformation1–3.Unlikeothercloakingonlym,1and1mustsatisfytherequirementsinequation(1),zruappro

4、aches4–6,whicharetypicallylimitedtosubwavelengthandthedispersionrelationsinsidethecloakremainunaffectedasobjects,thetransformationmethodallowsthedesignoflongastheproductsofmz1randmz1uarekeptthesameasthosecloakingdevicesthatrenderamacroscopicobjectinvis

5、ible.Indeterminedbythevaluesinequation(1).Itisworthnotingthataddition,thedesignisnotsensitivetotheobjectthatisbeingunderTMillumination,onlyonecomponentofmisofinterest,cloaked.Thefirstexperimentaldemonstrationofsuchacloakatwhichallowsustocompletelyremove

6、theneedforanyopticalmicrowavefrequencieswasrecentlyreported7.Wenote,magnetism.Inequation(1)wemultiply1rand1ubythevalueofhowever,thatthatdesign7cannotbeimplementedforanopticalmandobtainthefollowingreducedsetofcloakparameters:zcloak,whichiscertainlyofpar

7、ticularinterestbecauseopticalfrequenciesarewheretheword‘invisibility’isconventionally222bbradefined.Herewepresentthedesignofanon-magneticcloakmz¼1;1u¼;1r¼ð2Þbabaroperatingatopticalfrequencies.Theprincipleandstructureoftheproposedcylindricalcloa

8、kareanalysed,andthegeneralrecipefortheimplementationofsuchadeviceisprovided.ComparedtothecloakwithidealpropertiesasshowninequationThecoordinatetransformationusedintheproposednon-(1),thereducedparametersinequation(2)providethesamewavemag