原文-Intrinsic losses of coupled-cavity waveguides in planar-photonic crystals

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1、March15,2007/Vol.32,No.6/OPTICSLETTERS635Intrinsiclossesofcoupled-cavitywaveguidesinplanar-photoniccrystalsA.Martínez,J.García,P.Sanchis,F.Cuesta-Soto,J.Blasco,andJ.MartíNanophotonicsTechnologyCenter,UniversidadPolitécnicadeValencia,Valencia46022,SpainReceivedOctober31,200

2、6;revisedDecember7,2006;acceptedDecember12,2006;postedDecember20,2006(Doc.ID76641);publishedFebruary15,2007Coupled-cavitywaveguides(CCWs)allowlightpropagationwithstrongfieldconfinementinthecavitiesandsmallgroupvelocity,whichgreatlyenhancestheefficiencyofnonlineareffects.Inadd

3、ition,guidedmodeshavezerodispersionatthecentralregionofthetransmissionminiband.WeshowthatCCWscreatedinplanarphotoniccrystals,inwhichindexguidingisrequiredinsomespatialdimensions,areintrinsicallylossyintheregionofzerodispersion,whichstronglylimitstheiruseinnonlinearapplicat

4、ionsanddevices.©2007OpticalSocietyofAmericaOCIScodes:130.2790,130.3120,230.7390.Theefficientimplementationintermsofsizeandmodesthatcanbeguidedwithoutlosses,owingtothepowerconsumptionofall-opticalfunctionalitiesisaexistenceofthecladdinglightline(CLL)definedaskeysteponthewayto

5、wardlarge-scaleoptical
=ck/nc,where
istheopticalfrequencyandkis1integration.Tothisend,theuseofnonlinearmate-thewavevector.rialstochangetheresponseofaphotoniccircuitbyInthisLetter,weshowthataCCWcreatedonaexternalopticalinputsismandatory.Acriticalprob-planarPhCisintrinsicall

6、ylossyinthenear-zerolemisthatnonlineareffects(NLEs)inconventionalGVDregionwhenusingconventionalopticalmateri-materialsareusuallyweak,thusrequiringveryhighals(refractiveindexn4inthewavelengthregion1opticalintensitiesandlonginteractiondistances.atapproximately1550nm),which

7、stronglylimitsitsHigh-index-contrastwaveguidesprovidestronglightuseinnonlinearapplications.Intrinsiclossesarees-confinementinthenonlinearmedium,whichin-timatednumericallyforaCCWcreatedina1DPhC.creasestheefficiencyofNLEs.However,eveninthisSuchlossescanbereducedbyproperlydesig

8、ningthecase,theresultinglengthandpowerrequirementsCCWcavities,butlossescouldonlybesuppres