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1、TitaniumnitrideasaplasmonicmaterialforvisiblewavelengthsGururajV.Naik1,JeremyL.Schroeder2,TimothyD.Sands1,2andAlexandraBoltasseva1,3,∗1SchoolofElectrical&ComputerEngineeringandBirckNanotechnologyCenter,PurdueUniversityIndiana47907USA2SchoolofMaterialsEngi
2、neeringandBirckNanotechnologyCenter,PurdueUniversityIndiana47907USA3DTUFotonik,TechnicalUniversityofDenmark,Lyngby2800,Denmarkaeb@purdue.eduAbstract:Thesearchforalternativeplasmonicmaterialswithimprovedopticalpropertiesoverthetraditionalmaterialslikesilve
3、randgoldcouldultimatelyleadtothelong-awaited,real-lifeapplicationsofplasmonicdevicesandmetamaterials.Inthiswork,weshowthattitaniumnitridecouldperformasanalternativeplasmonicmaterialinthevisiblewavelengthrange.Weevaluatetheperformancesofvariousplasmonicand
4、metamaterialstructureswithtitaniumnitrideasaplasmoniccomponentandshowthattransformation-opticsdevicesandanimportantclassofmetamaterialswithhyperbolicdispersionbasedonTiNcouldsignificantlyoutperformsimilardevicesbasedonconventionalmetalsinthevisiblewaveleng
5、thsrange.©2010OpticalSocietyofAmerica1.IntroductionTherapidlyadvancingfieldsofplasmonics[1,2]andrelativelynewareasofmetamaterials(MMs)andtransformationoptics(TO)[3,4,5]continuetoboomwithrevolutionaryideasandexcitingexperimentalrealizations.Fantasticideassu
6、chasnegativerefractiveindexmaterials[6],nanoscaleimaging[7,8],invisibilitycloaks[9]andlightconcentrators[10,11]havepavedthewayfortherealizationofdeviceswithunprecedentedfunctionalities[12,13,14,15,16,17].Althoughtheexperimentalrealizationsofthesedevicesse
7、rveasproofs-of-concepts,theirpracticalapplicationsarestilloutofreach.Oneofthemajorchallengesisthelargelosscomingfromtheplasmoniccomponentsofthesedevices.Evenmetalswiththehighestconductivities(e.g.,silverandgold)exhibitexcessivelossesatopticalfrequencies[1
8、8].AnothermajorissueassociatedwiththeuseofconventionalmetalsisthattheirrealpartofpermittivityistoolargeinmagnitudetobeusefulformanyTOandMMdevices[10].arXiv:1011.4896v2[physics.optics]27Nov2010Inthesearchforbetterpla
