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1、PhotonenergylifterZenoGaburro,MherGhulinyan,FrancescoRiboli,andLorenzoPavesiDepartmentofPhysics,UniversityofTrentoandCNR-INFM,Povo,I-38050Trento,ItalyAlessioRecatia,andIacopoCarusottoCRSBEC-INFM,Povo,I-38050Trento,ItalyandaalsoatECT*,Villazzano,Trento,ItalyWeproposeatime-dependentphoton
2、icstructure,inwhichthecarrierfrequencyofanopticalpulseisshiftedwithoutchangingitsshape.Theefficiencyofthedevicetakesadvantageofslowgroupvelocitiesoflightattainableinperiodicphotonicstructures.ThefrequencyshiftingeffectisquantitativelystudiedbymeansofFiniteDifferenceTimeDomainsimulationsforr
3、ealisticsystemswithopticalparametersofconventionalsilicontechnology.Inseveralapplications,particularlyinthefieldofop-themedium.ticalsignalprocessing,itisdesirabletodisposeoftech-Thiseffectcanbeusedinaphotonicdevicetoshifttheniquesforcontinuousandefficientphotonenergycon-carrierfrequencyofaw
4、ave-packet(lightpulse),withoutversion.Mostofthenowadaysavailabletechniquesrelydramaticallyaffectingthepulseshape:todothis,itisoninelasticopticalprocesses.Forexample,stimulatedenoughtotriggertherefractiveindexshiftoncethepulseRamanscatteringhasbeensuccessfullyemployedforfre-hasenteredthem
5、edium,andtocompleteitbeforethequencyconversionandlasing[1].Unfortunatelyinelasticpulsestartsexiting.Inthisway,thetravellingpulseisprocessesareusuallynotefficient,oftenrequiringhighfullycontainedinthemediumduringthewholeindexintensities.Findingnewapproachestosuchataskisashiftprocess,andthe
6、mediumeffectivelyactsasaninfi-challengingproblem.RecentlyReedetal.[2]havepro-niteone.Theopticallinearityofthemediumguaranteesposedawaytochangethecoloroflightbycapturingitthatthedifferentk-componentsaredecoupled,andtheonapropagatingshockwavefrontandsuccessivereemis-pulseshapeispreservedinbo
7、ththerealandthek-space.sion.Unfortunately,theexperimentalimplementationofDynamicalphotonicstructures,inwhichtheopticalthisset-upisverydemandingforavailabletechnology.constantsofthemediumcanbemodulatedwhilethelightAsthetraveltimeτtravel=L/vgofthepulseacrosstheispropagatinginside
