新型人工电磁材料的人工手性与非对称传输分析

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1、新型人工电磁材料的人工手性及非对称传输研究AbstractChiralmetamaterialsthatcannotsuperimposedontotheirmirrorimagesexhibitmanytantalizingelectromagneticpropertiessuchasnegativerefraction,giantopticalactivityandcirculardichroism,andreciprocaldirectional-dependentasymmetrictransmission.Thesechiralme

2、tamaterialshaveattractedlotsofattentionduetotheirflexiblemanipulationofwavepolarizations.Duringthepastseveralyears,manykindsofmetamaterialswithsymmetry-brokenchiralstructureshavebeenusedtomanipulatewavepolarizationandachievemanycustomizedfunctionalitiesanddeviceslikecircula

3、randlinearpolarizers,polarizationrotators,polarizationspectrumfiltersandhandednessswitching.Opticalactivityisoneofthemostdistinguishedpropertiesinartificialchiralmetamaterialsthatwaswidelystudied.Importantly,giantopticalactivitywaseasilyrealizedbyelectromagneticfieldcouplin

4、ginthebilayeredchiralmetamaterial.Formetamateiralssimultaneouslyhavingplanarchirality(2Dchirality)andanisotropy,apreviouslyunknownphenomenon-asymmetrictransmission(AT)wasobserved,whichdoesnotoccursinconventional3Dchiralmetamaterials.Inthisthesis,wemainlyinvestigateasymmetri

5、ctransmissionandmanipulatepolarizationstatesofelectromagneticwavesinchiralmetamaterialstheoreticallyandexperimentally.Themainresearchtopicsandachievementsgainedareasfollows:1.WeproposeakindoflinearpolarizationrotatorconstructedbyusingtwopairsofplanarSRRstructureswithacertai

6、ntwistedangle.Thechiralmetamaterialcanachievestrongopticalactivityoflinearlypolarizedelectromagnetic(EM)waves.Wefindthatthisstructurehasanicetransmissioncoefficientandtransmittedwavepolarizationrotationangleissimilartothestructure’s,whichprovidesawaytodesignlinearpolarizati

7、onrotator.2.Basedonthetheoryoflinearasymmetrytransmission,weproposeadual-bandasymmetricchiralmetamaterialsinopticalfrequencies.Thedesignedchiralmetamaterialstructurehasmanyadvantagesincludingdual-bandasymmetrytransmission.Theresonantfrequenciesofpolarizationconversionscanbe

8、tunedbyvaryinggeometricparameters.Thefielddistributionsoftheresonantmodesverifytha