From electromagnetically induced transparency to absorption in planar optical metamaterials

(整期优先)网络出版时间:2013-11-21
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Wetheoreticallyinvestigatetheclassicalanalogofelectromagneticallyinducedtransparency(EIT)andelectromagneticallyinducedabsorption(EIA)inaplanarmetamaterialatopticalfrequency,whichoriginatesfromdestructiveandconstructiveinterferencebetweendarkandradiativeelements.Themetamaterialconsistsoftwocoupledresonatorswithdifferentgeometries.AnEIT-liketransparentwindowwithlowabsorptionisobservedandfoundtobestronglya?ectedbyresonantstatesoftheresonators.ThetransitionbetweentheEITandEIAisachievedbychangingthesplitwidthandcouplingdistance.Theabsorptionisenhancedupto2.5timescomparedwiththedipolarcase.TheexcitationofthedarkmodeisveryimportantforEIT-andEIA-likeresponsesoftheproposedmetamaterial.TheEITandEIAphenomenao?erapotentialmethodformanipulatingelectromagneticresponseinmetamaterial-baseddevices.