信息存儲聚合物穩(wěn)定液晶的光折變性質(zhì).pdf

1、復旦大學碩士學位論文信息存儲聚合物穩(wěn)定液晶的光折變性質(zhì)姓名：施磊申請學位級別：碩士專業(yè)：光學指導教師：趙有源2001.5.28星旦厶堂亟：蘭位迨塞塑噩論文題目：ThePhotorefractivityinOpticalDataStoragePolymer—StabilizedLiquidCrystalsAbstractPhotorefractivematerialsholdgreatpromiseforopticaldeviceappl

2、icationsintheal_easofreversibleopticalholographynoisefreeopticalimageamplification、phaseconjugatemirrors，andotheropticalsignalprocessingtechniquesTheDhotorefractiveeffectiSalight—inducedchangeintherefractiveindexofanonli

3、nearopticalmaterialItresultsfromcreationofanelectricfieldinducedbydirectionalchargetransportovermacroscopicdistancesFirstlyNematicliquidcrystalshavelongbeenknownteorientinmuchlowerelectricfields，evenreorientinginopticalf

4、ieldsThUS，thespacechargefieldsthatarerequiredtoproducecomparablechangesintherefractiveindexinnematicliquidcrystalsareordersofmagnitudelowerthanforpolymericmaterialsGiventhesereasons，wehavedevolopedthephotoractiveresearch

5、usingpolymerstabilizedliquidcrystals(PSLCs)Polymerstabilizedliquidcrystalsconsistonly1—2％ofapolymericmaterialthatcreatesananisotropictransparent，gel1ikematerialWereporthereoureflbrtsforcreatingpolymer—stabilizedliquidcry

6、stalsforphotorefractiveapplicationsSecond，adetaileddescriptionofthemechanismsofdirectopticaltorque，photoisomerizationandDhotorefractivitvandtheireffectsonthemacroscopicorderofliquidcrystalsiSdiscussedHeretheeffeCtSofphot

7、oinducedmolecularreorientationofPSLCsarefullyinterpretedwithintheframeworkofclassicalelectrodynamicsandstandardcontinuumtheoryofliquidcrystalsInthethirdchapterweintroduceourmethodstomakethePSLCssamplesindetailsThenematic

8、LCiSaeutecticmixtureof35wt％4’(n—octyloxy)一4一cyanobiphenyl(80CB)and65％4(n—pentyl)一4cyanobiphenyl(5CB)TheLCisdopedwithperylene，N1andpolystyrenewithC60inthesidegroup，whichactsaselectrondonorandacceptorrespectivelyFinally，tw

9、obeamcouplingexperiments，fourwavemlxmgexperimentsandselfbunrpedphasecor!jugationexperirnentsareperformedtocharacterizethephotophysicsofthesenovelmaterialsPolymerstabilizationaltersthechargetransportandtrappingcharacteris

10、ticsofLCs，resultinginperslstentlivedgratingsFurtheril“10rethenetphotorefractivegain(r)of441cm。。in2BC，andthediffractionefficiencyof29％inFWMwerealsomeasuredKe3，words：PolymerstabilizedLiquidCrystals，Photorefractivity，Two’be