Dynamic control of the terahertz rainbow trapping effect based on a silicon-filled graded grating.pdf

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1、Chin.Phys.BVol.26,No.1(2017)017301Dynamiccontroloftheterahertzrainbowtrappingeffectbasedonasilicon-filledgradedgratingShu-LinWang(王书林)1,LanDing(丁岚)1,†,andWenXu(徐文)1,2,‡1SchoolofPhysicsandAstronomy,YunnanUniversity,Kunming650091,China2KeyLaboratoryofMaterialsPhysics,InstituteofSolidStateP

2、hysics,ChineseAcademyofSciences,Hefei230031,China(Received11August2016;revisedmanuscriptreceived23September2016;publishedonline30November2016)Wetheoreticallyproposeaschemetorealizethedynamiccontrolofthepropertiesoftheterahertz(THz)rainbowtrappingeffect(RTE)basedonasilicon-filledgradedgrat

3、ing(SFGG)inarelativelybroadbandviaopticalpumping.Throughthetheoreticalanalysisandfinite-elementmethodsimulations,itisconceptuallydemonstratedthatthebandoftheRTEcanbedynamicallytunedinarangeof0.06THz.Furthermore,theSFGGcanalsobeopticallyswitchedbetweenadevicefortheRTEandawaveguideforrelea

4、singthetrappedwaves.TheresultsobtainedheremayimplyapplicationsforthetunableTHzplasmonicdevices,suchason-chipopticalbuffers,broadbandslow-lightsystems,andintegratedopticalfilters.Keywords:metamaterials,subwavelengthstructures,slowlight,terahertzPACS:73.20.Mf,78.67.PtDOI:10.1088/1674-1056/2

5、6/1/0173011.Introductiongradualstructuresistoemploymaterialsexhibitingalargethermo-opticeffectinthestructuresandtocontroltheirre-Bycarefullydesigningtheparametersofmetamaterialsfractiveindicesbychangingthetemperature.[7]However,theandplasmonicstructures,itispossibletostopeachfrequencythe

6、rmaltuningmethodcanonlybeusedtoreleasethetrappedcomponentofanelectromagnetic(EM)wavepacketatdif-waves,anditisnotsuitableforapplicationsthatrequireahighferentlocationsofthestructures.Thiskindofslow-lightspeedmodulationsincethethermal-opticeffectisarelativelyphenomenoniswellknownastherainb

7、owtrappingeffectslowprocess.Recently,akindofsilicon-filledmetallicgrat-(RTE),[1]whichcanfindpotentialapplicationsinnonlinearingwithconstantgroovedepthwasproposedtorealizeahighoptics,signalprocessing,andopticalmemory.Compared[11]speedcontroloftheRTEinTHzdomain.Sincetherefrac