Influence of Photonic Crystal on Fluorescence Resonance Energy Transfer Efficiency between Laser Dyes英文文献资料

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1、Articlepubs.acs.org/JPCCInfluenceofPhotonicCrystalonFluorescenceResonanceEnergyTransferEfficiencybetweenLaserDyesSunitaKedia*andSucharitaSinhaLaserandPlasmaTechnologyDivision,BhabhaAtomicResearchCentre,Mumbai400085,India*SSupportingInformationABSTRACT:Spontaneousemissionb

2、yanexcitedmoleculestronglydependsupontheavailabledensityofstatesintowhichthemoleculecandecay.Inaphotoniccrystal,theallowedlocaldensityofstatesdepleteswithinthestopbandandenhancesatthebandedgeofthecrystal.Asaresult,anemitterimplantedinaphotoniccrystalisforcedtoredistrib

3、uteitsfluorescenceenergywithinitsemissionspectralrange,anditsspontaneousemissionspectrumthusgetsmodified.Here,westudiedtheinfluenceofchangeinlocaldensityofstatesonenergytransferefficiencybetweenadonor−acceptorpairembeddedinacolloidalphotoniccrystal.Rhodamine-BandRhodamine-8

4、00dyeswerechosenastheenergydonorandenergyacceptor,respectively.Weobservedanangle-dependentquenchingintheemissionintensityofthedonoraccompaniedbyenhancementinacceptoremissionwhenbothdyeswereinthephotoniccrystal.Thisoccurredowingtodepletionintheallowedlocaldensityofstate

5、savailabletothedonor.Reductioninthefluorescencelifetimeofthedonorinthepresenceoftheacceptorconfirmedfluorescenceresonanceenergytransferbetweenthechromophores.Inspiteofmarginaloverlappingbetweentheemissionbandofthedonorandtheabsorptionbandoftheacceptor,theenergytransfereffic

6、iencybetweenthedyeswas∼80%inthephotoniccrystalenvironment.Thisenhancementresultedfromforcedproximityandhencereducedintermoleculardistancebetweenthedonorandacceptoronbeingphysicallyrestrictedwithinnanovoidsofthephotoniccrystal.1.INTRODUCTIONdepletedforthisspecificwavelen

7、gthrangeforalldirectionsofpropagation.SuchPhCshavebeenexploitedtodemonstrateThree-dimensional(3-D)photoniccrystals(PhCs)havebeen910lowthresholdlasingandwaveguiding.investigatedwidelybecausetheyprovideahandyroutetoTherearemainlytwoapproachesforfabricationofPhC,controlan

8、dalterthepropagationofelectromagneticwaves.1112lithographyandself-assembly.Amongthese,self-assemblyPhCsareartificialst