Superprism Phenomena in Photonic Crystals Toward Microscale Lightwave Circuits

《Superprism Phenomena in Photonic Crystals Toward Microscale Lightwave Circuits》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、2032JOURNALOFLIGHTWAVETECHNOLOGY,VOL.17,NO.11,NOVEMBER1999SuperprismPhenomenainPhotonicCrystals:TowardMicroscaleLightwaveCircuitsHideoKosaka,TakayukiKawashima,AkihisaTomita,MasayaNotomi,ToshiakiTamamura,TakashiSato,andShojiroKawakamiAbstractÐThesuperprismphenomenon,thedispersionoflight500timess

2、trongerthanthedispersioninconventionalprisms,wasdemonstratedatopticalwavelengthsinphotoniccrystals(PC's)fabricatedonSi.Drasticlight-beamsteeringinthePC'swasachievedbyslightlychangingtheincidentwavelengthorangle.Thescanningspanreached50withonlya1%shiftofincidentwavelength,andreached140withonl

3、ya14shiftoftheincidentangleatwavelengthsaround1m.Thepropaga-tiondirectionwasquantitativelyinterpretedintermsofhighlyanisotropicdispersionsurfacesderivedbyphotonic-bandcal-Fig.1.Schematicillustrationofsuperprismphenomena.Thewavelengthculation.Thephysicsbehindthisdemonstrationwillopenadispersion

4、inasuperprismmadeofPC'sisapproximately500timesstrongerthaninaprismmadeofconventionalcrystals.novelfieldcalledphotoniccrystallineoptics.Theapplicationofthesephenomenapromisestoenablethefabricationofintegratedmicroscalelightwavecircuits(LC's)onSiwithlargescaleahugedeflectionoflightinsideaPC:thisef

5、fectwasmoreintegrated(LSI)-compatiblelithographytechniques.SuchLC'sthan50timesstrongerthanthatshownbyLinetal.orthatwillallowmoreefficientuseofwavelengthresourceswhenusedofaconventionalgratingandabout500timesstrongerthaninwavelengthmultiplexers/demultiplexersordispersioncompen-satorsbyenablinglo

6、werlossandbroaderbandwidth.thatofaconventionalprism.Toemphasizethisdifference,wecalleditasuperprism[11],[12].IndexTermsÐIntegratedoptics,lightdeflectors,opticalbeams,Thephysicsunderlyingthosetwophenomenaaretotallyopticaldiffraction,opticalplanarwaveguides,opticalpropaga-tion,opticalrefraction,ph

7、otoniccrystals.different.Linetal.assumedisotropicdispersion,andascribedthedeflectiontothemodificationoftherefractiveindexthroughthenonlinearityinthedispersionrelationdeterminedI.INTRODUCTIONbythephotonicbandstructure.Incontrast,wein