文档名：二氧化钒在太赫兹超材料中的研究进展
摘要：超材料具有在亚波长尺度下操控电磁波的能力,近年来,通过对光场、电场、机械或温度场动态调控可以改变其光学特性的主动式超材料受到了广泛的研究.二氧化钒具有在68℃的临界温度下从低温绝缘相转变为高温金属相的特性,其电导率能够实现4～5个数量级的变化,将二氧化钒与超材料相互结合,能够满足可调谐性、高调制深度、多种调谐手段等优点.本文从二氧化钒的相变特性出发,归纳总结了二氧化钒在太赫兹超材料中的不同应用方向,主要包括可调谐太赫兹超材料吸波器、太赫兹调制器、太赫兹波前调控器以及可编程超材料,最后讨论了二氧化钒在太赫兹超材料应用中所面临的挑战和未来的发展方向.
Abstract：Therearemanyapplicationsforterahertz(THz)wavesatdifferentfrequenciesfrom0.1THzto10THzanddifferentwavelengthsbetweenmillimeterwavesandinfraredlight.THzwaveshaveattractedrecentattentionduetotheirextensiveapplicationsindetection,imaging,andcommunication.IntermsofthepropertiesofnaturalmaterialstoTHzwaves,THzmodulationdeviceshavesomelimitationsduetothenaturalmaterialproperties.THzmetamaterials,whichuseperiodicstructurestomodifythephase,amplitude,polarization,andpropagationmodeofTHzwaves,canovercomethelimitationsofnaturalmaterials.Comparedtopassivemetamaterialswithfixedopticalproperties,activemetamaterialsaremorecapableofreconfiguringandprogrammability.Anactivemetamaterialcanbeachievedviacombiningmetamaterialstructuralunitswithtunablefunctionalmaterials.Vanadiumdioxide(VO2),undergoingametal-insulatorphasetransition,exhibitsmodulationdepthsexceeding85%inelectromagneticwavetransmittancefrominfraredtoTHzfrequencies.Comparedwithotherphasetransitionmaterials(i.e.,GeTe),thephasetransitiontemperatureisclosertoroomtemperature.VO2hasapromisingapplicationinactiveTHzmetamaterialsduetoitscharacteristics.ThisreviewrepresentedthedesignprinciplesanddevelopmentofreconfigurableTHzmetamaterialsbasedonVO2,emphasizingthestructuraldesignandperformanceofdevicesfortunableTHzmodulation.ThestructureandperformanceofVO2-basedTHzmetamaterialsweredescribed.Inthefirstpartofthisreview,theapplicationofVO2intunableTHzmetamaterialabsorbersisrepresented.ThephasetransitionofVO2alterstheequivalentresistance,capacitanceandinductanceoftheperiodicpatternviareplacingtheconventionalsurfacemetalpatternsofabsorberswithpatternedVO2,resultingintunableresonanceabsorptionfrequenciesandabsorptionrates.Moreover,combiningVO2withdifferentresonancepatternsorotherfunctionalmaterialscanfurtherenhancethemodulationdepthandmodulationfrequencyofTHzabsorbers.Inthesecondpartofthisreview,wediscusstheapplicationofVO2inTHzmodulatordevicesbasedontheelectromagneticallyinducedtransparency(EIT)effect.TheEITeffectinmetamaterialsisachievedviacoupling"brightmodes"and"darkmodes"inanexternalfieldtogenerateatransparentwindow.IntegratingVO2intosuchterahertzmetamaterialscanimprovetheinstabilityissueoftraditionalmaterialsinexcitingtheEITeffectandfurtherenhancethetunabilityofmetamaterials.Thisapproachalsoprovidesafeasiblesolutionforinformationencryption.Inaddition,comparedtoconventionalmetamaterialsforwavefrontmanipulation,thecombinationofVO2andmetamaterialsallowsasimultaneousmanipulationoftheamplitudeandphaseofTHzwaves,whichsignificantlyimprovesaholographicimagingqualityandoffersadesignapproachforTHzimaging,opticalencryption,opticalcommunication,andotherapplications.Notethatalthoughthephasetransitionperformanceofvanadiumdioxidecanbeadjustedtheoretically,thethermalcontrolmethodissusceptibletotheinfluenceofthermaldiffusionfromneighboringunits,resultinginathermalcrosstalk.Itisthusessentialforfutureeffortsincreasingunitdensityandimprovingthequalityofholographicimagingtointegratelowthermalconductivitymaterialsbetweenunitstructures.Inthefinalpartofthisreview,weintroducetheuseofVO2inTHzprogrammablemetamaterials.Programmablemetamaterialsprovidesomedesignconceptsanddirectionsformetamaterialsdevelopment.CombiningVO2withmetamaterialsandthehysteresiseffectoffirst-orderphasetransition,VO2demonstratesasanonvolatilestoragecomponentinprogrammablemetamaterials.Inthisapproach,transitionstatesarestoredas"memory",allowingforintelligentTHzelectromagneticinformationprocessing,andthismemoryfunctionalitycanbealsousedforadaptivecontrol.SummaryandprospectsDespitethedevelopmentoftunableTHzmetamaterialsbasedondifferentprinciples,therearesomechallengesassociatedwiththedifficultetchingofVO2aswellasthelimitedprecisionoftheprocess.Inaddition,VO2isnotthemoststablephaseofvanadiumoxide,whichisgreatlyaffectedbyoxygenduringetching,affectingtheperformanceofTHzmetamaterialdevices.Forfutureapplications,powerconsumptionandresponsetimemustbeconsidered.Itisthereforepossibletoachievelowerpowerconsumptionandfasterthermalresponsetimeviadopingvanadiumdioxideortuningthestainbythesubstratetolowerthephasetransitiontemperature,althoughthismayintroducesomechallengessuchasadecreaseinthemagnitudeoftheconductivitychangeafterthephasetransitionandareductioninmodulationdepth.Bycontrast,itispossibletosignificantlyimprovetheresponsetimeofdevicesbyusingpulsedintenselaserexcitation.Furthermore,machinelearningandothermethodscanbeintegratedtoachieveadditionalstructuraloptimization.Field-programmablegatearray(FPGA)controlledprogrammablemetamaterials,whichcanswitchdifferentfunctionsviachanginginputencodingsequencesinrealtime,andgreatlyextendtheapplicationofmetamaterialsbydynamicallymanipulatingelectromagneticwaves.Metamaterialsapplicationandfunctionalitywillbeenhancedbyaddingsensorstodetecttemperature,humidity,illumination,etc.,facilitatingthedevelopmentofintelligentelectromagneticmetamaterialswithtunablepropertiesinthefuture.
作者：高敏 罗毅恒 路畅 林媛Author：GAOMin LUOYiheng LUChang LINYuan
作者单位：电子科技大学材料与能源学院,成都610054
刊名：硅酸盐学报 ISTICEIPKU
Journal：JournaloftheChineseCeramicSociety
年，卷(期)：2024, 52(7)
分类号：TB332
关键词：超材料 二氧化钒 相变材料 可调谐
Keywords：metamaterial vanadiumdioxide phasechangematerials tunable
机标分类号：TN761O441.4TB34
在线出版日期：2024年7月24日
基金项目：国家自然科学基金，国家自然科学基金，国家自然科学基金，四川省科技计划二氧化钒在太赫兹超材料中的研究进展[
期刊论文] 硅酸盐学报--2024, 52(7)高敏 罗毅恒 路畅 林媛超材料具有在亚波长尺度下操控电磁波的能力,近年来,通过对光场、电场、机械或温度场动态调控可以改变其光学特性的主动式超材料受到了广泛的研究.二氧化钒具有在68℃的临界温度下从低温绝缘相转变为高温金属相的特性,其电...参考文献和引证文献
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