Polarization sensitivity contributes to multiple band spectra of one mid-infrared absorber

(整期优先)网络出版时间:2014-10-20
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Theemergingperfect-absorbermetamaterials(PAMs)provideanalternativematerialapproachforthenextgenerationofelectromagneticdetectionatanyfrequencybandofinterest.Onetypeofdualcross-shapedPAMsisdevelopedtoobtainmultiplex-bandspectrumabsorptionatmid-infraredregion.Threedistinctabsorptionpeaksareattributedtothepolarizationsensitivityexcitationoftheplasmonicresonance.Thechargedensitydistributions,whichareexcitedbyresonantelectromagneticwavespassingthroughthePAMsmedium,provideinsightsintotheobservedabsorptionbehavior.WefindthattheretrievedopticalpropertiesofthePAMsincludingpermittivityandpermeabilityarestillconsistentwiththesumoftheDrudeandLorentztypemodelsatwavelengthsrangingfrom2.0to10.0mm.Suchmultiplex-bandabsorptionpropertiesenabletheproposedPAMsapowerfultoolforthedirectdetectionofmultiplemolecularvibrationalstructures,andformultiplespectrainfrareddetection.