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1、EngineeringnonlinearresponseofnanomaterialsusingFanoresonancesDenizTurkpence,1GursoyB.Akguc,2AlpanBek,3,4andMehmetEmreTasgin11InstituteofNuclearSciences,HacettepeUniversity,06532,Ankara,Turkey2DepartmentofPhysics,BilkentUniversity,06800,Ankara,Turkey3Departme
2、ntofPhysics,MiddleEastTechnicalUniversity,06800,Ankara,Turkey4TheCenterforSolarEnergyResearchandApplications(GUNAM),MiddleEastTechnicalUniversity,06800,Ankara,Turkey(Dated:July23,2018)Weshowthat,nonlinearopticalprocessesofnanoparticlescanbecontrolledbythepres
3、enceofinteractionswithamoleculeoraquantumdot.Bychoosingtheappropriatelevelspacingforthequantumemitter,onecaneithersuppressorenhancethenonlinearfrequencyconversion.Werevealtheunderlyingmechanismforthise ect,whichisalreadyobservedinrecentexperiments:(i)Suppress
4、ionoccurssimplybecausetransparencyinducedbyFanoresonancedoesnotallowanexcitationattheconvertedfrequency.(ii)Enhancementemergessincenonlinearprocesscanbebroughttoresonance.Pathinterferencee ectcancelsthenonresonantfrequencyterms.Wedemonstratetheunderlyingphysi
5、csusingasimpli edmodel,andweshowthatthepredictionsofthemodelareingoodagreementwiththe3-dimensionalboundaryelementmethod(MNPBEMtoolbox)simulations.Here,weconsiderthesecondharmonicgenerationinaplasmonicconverterasanexampletodemonstratethecontrolmechanism.Thephe
6、nomenonisthesemi-classicalanalogofnonlinearityenhancementviaelectromagneticallyinducedtransparency.PACSnumbers:42.50.Gy,42.65.Ky,73.20.MfKeywords:Secondharmonicgeneration,enhancement,Fanoresonances,plasmonsI.INTRODUCTIONnances{analogoustoelectromagneticallyin
7、ducedtrans-parency[28]{hasalsobeenobservedinplasmonicexci-tationsofMNPs[2,29{37].Theattachmentofaquan-Resonantinteractionofmetalnanoparticles(MNPs)tumoscillator[e.g.amoleculeoraquantumdot(QD)]withopticallightprovidesatoolforthestronglocaliza-toaMNPstronglymod
8、i estheopticalresponseofthetionofelectromagnetic eld[1].Intensityenhancements5hybridmaterial[2,19,38{41].Thepresenceofaquan-ashighas10canbeachieved[1,2]withinthelocal-tumoscillatorwithsma
