Femtosecond Laser Direct Writing for Eternal Data Storage Advances and Challenges br

Wang Lei,Zhang Xu,Wang Yi,Wang Lin,Wang Qing,Zang Xue, Li Ruifan,Xu Yishi,Li Zhenze,Chen Qidai

Chinese Journal of Lasers（2022）

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摘要

Significance Nowadays the using of bigdata isreshapingourlivesviaartificialintelligenceAIandinternetofthingsIoTbypenetratingeducationmedicalcarebusinessentertainmentandsoonIndustrialcompaniesaroundtheworldaresparingnoefforttocollectmuchdatatoobtainmarketconditionscompetitorsandlogisticsinformationforprofitsandhavelongcreatedTB-orevenPB-scaleinformationMeanwhileconsumersareintegratingsocialmediaentertainmentandreal-timepersonalizedservicesonmobiledevicestoconnectwithfriendsandshoponlineAccordingtotheInternationalDataCorporationIDCthereisanexplosivegrowthinglobaldatawhichisestimatedtoreach175zettabytesZBsby2025HoweverthedisparitybetweentheamountofdigitaldataandtheavailablestoragecapacitiesisenlargingMostimportantlydatastorageaccountsfor1%ofglobalelectricityconsumptionandexertenormouspressureonresourcesandenvironmentsHowevernoneofthecurrentmediumiscapabletomeettherequirementsInespecialthecolddatastoragethatisforculturehistoryscientificresearchandtheseimportantbutinfrequentlyuseddataisurgentlycallingforlong-termandhighcapacitymediumThereforewearechallengedwiththearduoustaskofdevelopingnext-generationdatastoragetechnologieswherefemtosecondlaserdirectwritingforeternaldatastorageoffersapracticalsolutionwithlowenergyconsumptionlonglifetimeandhighcapacityWithmultiplexingdegreesoffreedomthistechnology????sachievablelimitcapacitycouldreach360TBdiscFurthermoreacceleratedagingmeasurementsshowthatnanogratinghasunprecedentedlyhighstabilityincludingthermalstabilityupto1000 degrees CandapracticallyunlimitedlifetimeProgressWereviewedtheresearchprogressoffemtosecondlaserdirectwritingforeternaldatastorageAtfirstweintroducetheinteractionbetweenfemtosecondlaserandmaterialsbyreviewingthreetypesofmodificationOnthisbasistheconceptandbasicphysicalmechanismoffemtosecondlaserpermanentopticalstoragewereintroducedThenwereviewedthedevelopmentof3Dopticalstorageand5DopticalstorageaswellasthestructureformationmechanismindetailNextweintroducedthehigh-densitystorageofover100layersandfastdatarecordingataspeedof100kBsviaasinglechannelpotentialMBsviamultichannelAtthefinalbasedonelectronicfieldcontinuityconditionsatthenanoscalewecalculatedthetheoreticalbottleneckandphysicallimitofopticalstoragebyfemtosecondlaserdirectwritingConclusionandProspectFemtosecondlaserdirectwritinginsidehardmaterialsforpermanentopticalstorageprovidesanunexceptionablesolutionforcolddatastoragetomeetthedemandsofbigdataeraHowevertherearestillsomesignificantscientificandtechnicalproblemsthatmustbeaddressedbetweenthelaboratoryandtheindustrialapplicationForinstancevolumesofnanogratingmustbeminimizedandthedotandlayerspacingmustbereducedtoincreasethestoragedensityMoreoverfastwritingwithfewerpulsesandnewdatareadoutalgorithmsforaccurateandfastdatareadoutarerequiredWefirmlybelievethistechnologywillsupporteveryaspectofourlivesandbringhugeeconomicbenefitstosociety in the future

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关键词

photoelectric device processing, femtosecond laser, laser materials processing, laser-matter interactions, optical storage, nanograting

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