18 Composite Metamaterials, Negative Refraction, and Focusing

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1、FilippoCapolino/TheoryandPhenomenaofMetamaterials_CFinalsPage--#18CompositeMetamaterials,NegativeRefraction,andFocusing.Introduction.........................................-.Left-HandedMetamaterial...........................-

2、.NegativeRefraction..................................-EkmelOzbay.SubwavelengthImaging..............................-BilkentUniversity.Conclusions..........................................-KorayAydinAcknowledgments............................

3、.............-BilkentUniversityReferences.................................................-18.1IntroductionInrecentyears,left-handedmetamaterials(LHMs)havebecomearemarkableresearchareaandhavereceivedaconsiderableamountofinterestduetotheirexoticelectro

4、magneticpropertiesthatarenotattainablefromcommonmaterials.Theleft-handedmediaphenomenonwasbroughttotheattentionofthescientificcommunitybyVeselagofourdecadesago[]andhasreceivedgreatattentioninrecentyearssincethefirstexperimentaldemonstrationofLHMsbySmitheta

5、l.[,].Thedielectricpermittivity(ε)andthemagneticpermeability(μ)arebothpositivefornaturalmaterials.Infact,itispossibletoobtainnegativevaluesforεandμbyusingproperdesignsofmetamaterials.Anarrayofsplitringresonators(SRRs)exhibitsnegativeeffectivepermeability(

6、μeff)valuesforfrequenciesclosetothemagneticresonancefrequency(ωm)oftheSRRs[].Combiningnegativepermittivitymediatogetherwithnegativepermeabilitymediaresultsinametamaterialwithanegativerefractiveindexprovidedthatthenegativevaluesofpermittivityandpermeability

7、coincideatcertainrangeoffrequencies[].Metamaterialsoffernovelproperties,suchasnegativerefraction,subwavelengthimaging,andcloaking.Inthisstudy,wereviewourresearcheffortsinthefieldofmetamaterialsandreportonthetrans-mission,reflection,refraction,andimagingpro

8、pertiesoftwo-dimensional(D)LHMscomposedofSRRsandthin-wiremedia.Aleft-handedtransmissionbandisobservedwithinthefrequencyregionwherebothεandpermeabilityμarenegative.Therefractiveindexisverifiedtobenegat