[2008] Physical configuration and performance modeling of all-dielectric metamaterials

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1、PHYSICALREVIEWB77,045104
2008Physicalconfigurationandperformancemodelingofall-dielectricmetamaterialsAkramAhmadiandHosseinMosallaei*AppliedElectromagneticsLab.,ECEDepartment,NortheasternUniversity,Boston,Massachusetts02115,USA
Received17April2007;revisedmanuscriptreceived20September2007;publish

2、ed4January2008Inthispaper,physicalconceptandperformanceanalysisofall-dielectricmetamaterialsarepresented.Metamaterialswithdesiredmaterialparameters
±
,±aredevelopedbycreatingelectricandmagneticresonantmodes.Dielectricdiskandsphericalparticleresonatorsareconsideredasthegreatcandidatesforestab

3、lishingthedipolemoments
metamaterialalphabet.AfullwaveÞnitedifferencetimedomaintechniqueisappliedtocomprehensivelyobtainthephysicalinsightsofdielectricresonators.Near-ÞeldpatternsareplottedtoillustratethedevelopmentofelectricandmagneticdipoleÞelds.Geometric-polarizationcontrolofthedipolemoment

4、sallows
andtobetailoredtotheapplicationofinterest.All-dielectricdoublenegativemetamaterialsaredesigned.Engineeringconcerns,suchaslossreductionandbandwidthenhancementareinvestigated.DOI:10.1103/PhysRevB.77.045104PACSnumber
s:42.70.Qs,94.20.wsI.INTRODUCTIONsically,theyproposedtwosetsofspheresha

5、vingthesamedielectricmaterialsbutdifferentradii.ThedielectricmaterialMetamaterialsarereceivingincreasingattentionintheofspheresismuchlargerthanthehostmaterial,suchthatthescientiÞccommunityinrecentyearsduetotheirexcitingphysicalpropertiesandnovelpotentialapplications.1Ð5Towavelengthinsidethesphe

6、resiscomparabletotheirdiam-eters,andatthesametimethewavelengthoutsidetheachieveametamaterialwithadesiredÞgureofmerit,itisspheresislargeincomparisontothespheressizes.Theelec-requiredtoÞrstcreateappropriateelectricandmagneticdi-tromagneticÞeldsinsidethiscompositecanbeviewedasthepolemoments
insmal

7、l-sizescalesutilizingavailablemate-superpositionofelectricandmagneticdipolesandmultipolesrialsandthentailortheirarrangementtotheapplicationofofthespheres.Sincethepermittivityofspheresismuchinterest.Basically,theelectricandmagneti