简介：Lyingbetweenradiofrequencyandinfraredradiation,terahertz(THz)waveencounterslotsofdifficultiestoproduce,detect,transmit,andmodulate.GreateffortshavebeenmadetoconstructTHzdevices,includingsources,detectors,switches,modulators,lenses,andfilters.However,onlymoderateprogresseshavebeenmadeinTHzgenerationanddetection.Furthermore,thedevicesandtechniquestocontrolandmanipulateTHzwavesarestillinitsinfancy.Therefore,itisstillachallengetodateto

简介：ThemethodsforprotectingInPsurfaceagainstdegradationduringannealing,includingencapsulantandencpsulant-freetechniques;rapidthermalan-nealingofInPimplantedlayers;implantedionspeciesandsomeprofilesoftypicaldopants,etc.,theyareallthekeytechniquesconcerningionimplantationintose-mi-insulatingInP,andhavebeenreviewedsyntheticallyaswell.

简介：Theliquidcrystalcompositematerialsconsistofmicrodroplersofliquidcrystalswhicharespontaneouslyformedinamatrixofapolymeratthetimeofitspolymerization.Thedirectorconfigurationinliquidcrystaldroplets.themodeloforientationofdroplets,andthecontrastratiosofacellareinvestigated.Dropletsize,spacinganddistributionarereadilycontrolledinthesematerialstoallowoptimizationofdisplaysbaseduponelectricallycontrolledlightscatteringfromtheliquidcrystaldroplets.Preliminaryexperimentalandtheoreticalstudiesofthelightscatteringandelectro-opticresponseofnewmaterialshowthatthesematerialscanoffernewfeaturessuitableforlargeareadisplaysandlightvalves.

简介：Theheatedprocessofrawmaterialsforelectrontrappingmaterials(ETM)isinvestigatedbythermo-analysismethod.Thetemperaturerangesofrawmaterialsexperiencedsomephysicalandchemicalchangeprocesses,suchasdehydration,organicsolventremoval,crystalsulphurburning,oxidationofalkalineearthsulfidesandsolidphasereaction(rareearthdoped)andsoon,areobtained.TheexperimentalresultsalsoshowthatthepresenceoftraceoxygeninshieldedgasisveryharmfultopreparetheETM.Therawmaterialthermo-analysisresultsprovideveryimportantexperimentalreferenceforoptimizingtheETMpreparationtechniques.

简介：材料，体积或平面波导的有弹性、震动的性质，被Brillouin和拉曼光谱学学习在眼镜陶艺跟随nanocrystals生长的过程。nanoparticles原因外观在低频率拉曼光谱，典型山峰，谁的放，取决于晶体的尺寸。同时，由于光声子，锋利的水晶山峰出现在拉曼系列，允许起核心作用的阶段，和Brillouin山峰的频率移动的决心被观察。CLC数字TB383现在的工作与MIUR-FIRBRBNE012N3X的金融支持部分被资助了，MIURPRIN，轻拍FAPVU2004鈥?006。

简介：Nonlinearfrequencyconversionisoneofthemostfundamentalprocessesinnonlinearoptics.Ithasawiderangeofapplicationsinourdailylives,includingnovellightsources,sensing,andinformationprocessing.Itisusuallyassumedthatnonlinearfrequencyconversionrequireslargecrystalsthatgraduallyaccumulateastrongeffect.However,thelargesizeofnonlinearcrystalsisnotcompatiblewiththeminiaturisationofmodernphotonicandoptoelectronicsystems.Therefore,shrinkingthenonlinearstructuresdowntothenanoscale,whilekeepingfavourableconversionefficiencies,isofgreatimportanceforfuturephotonicsapplications.Inthelastdecade,researchershavestudiedthestrategiesforenhancingthenonlinearefficienciesatthenanoscale,e.g.byemployingdifferentnonlinearmaterials,resonantcouplingsandhybridizationtechniques.Inthispaper,weprovideacompactreviewofthenanomaterials-basedefforts,rangingfrommetaltodielectricandsemiconductornanostructures,includingtheirrelevantnanofabricationtechniques.

简介：Transparentbrittlematerialssuchasglassandsapphirearewidelyconcernedandappliedinconsumerelectronics,optoelectronicdevices,etc.duetotheirexcellentphysicalandchemicalstabilityandgoodtransparency.Growingresearchattentionhasbeenpaidtodevelopingnovelmethodsforhigh-precisionandhigh-qualitymachiningoftransparentbrittlematerialsinthepastfewdecades.Amongthevarioustechniques,lasermachininghasbeenprovedtobeaneffectiveandflexiblewaytoprocessallkindsoftransparentbrittlematerials.Inthisreview,aseriesoflasermachiningmethods,e.g.laserfullcutting,laserscribing,laserstealthdicing,laserfilament,laserinducedbacksidedryetching(LIBDE),andlaserinducedbacksidewetetching(LIBWE)aresummarized.Additionally,applicationsofthesetechniquesinmicromachining,drillingandcutting,andpatterningareintroducedindetail.Currentchallengesandfutureprospectsinthisfieldarealsodiscussed.

简介：AseriesofsamplesdepositedbyVHF-PECVDatdifferentpressureswerestudied.Themeasurementresultsofphotosensitivity(photoconductivity/darkconductivity)andactivationenergyindicatednearthesamerulewiththechangeofthepressure.TheresultsmeasuredbyRamanscatteringspectra,X-raydiffractionandFTIRallprovedtheevidentcrystallizationofthematerials.Treatingthep/iinterfacebyhydrogenhasagreatimprovingeffectontheperformanceofthemicrocrystallinesilicon(μc-Si)p-i-nsolarcellsifthetreatmenttimewasappropriate.Anefficiencyof4.24%forμc-Sip-i-nsolarcellsdepositedbyVHF-PECVDwasfirstlyobtained.

简介：TheinfluenceoftemperatureandGacompositiononAugerrecombinationlifetimeinn-typeandp-typeIn1-xGaxAsmaterialsisinvestigatedthroughthesimulation,assumingtheconcentrationsofelectronsandholesare1017cm-3and1018cm-3,respectively.TheresultsshowthatthetemperaturehaslittleinfluenceonAugerrecombinationlifetimeofIn1-xGaxAsmaterialsatx<0.3.However,ithasagreatimpactwhenx>0.3andtheeffectismoreobviousatalowertemperature.Moreover,Augerrecombinationlifetimeofp-typeIn1-xGaxAsislongerthanthatofn-typeIn1-xGaxAswiththesametemperature,Gacompositionandcarriersconcentration.

简介：Theprobe-fedpatchantennaswereproposedbychangingtheparameterssuchasdielectricmaterialsanddimensionsofpatchfordetailinvestigationofchangesinoutputcharacteristics.Fourrectangularslotswereintroducedseparatelyforoptimizingtheantennadesignandcharacteristics.Thisstudyillustratedthechangesofoutputcharacteristicsofanantennawithrespecttothenumberofintroducedslotsontheradiatingpatchinadditiontotheeffectofvariousdielectricmaterialsonantennaperformances.Theantennaperformanceswereanalyzedbyplottingtheobservationofvariousdielectricmaterials.Thechangesofantennacharacteristicswerealsoobservedbyintroducingfournumbersofslotsoneachedgeofthepatchtoimproveradiationcharacteristicswithawiderimpedancebandwidth.

简介：Inthispaper,thephotonicbandgapofphotoniccrystalswithchiralandnegative-indexmaterialsalternatelyisinvestigated.Itisshownthatthiskindofphotoniccrystalexhibitsverywidephotonicbandgap.Thephotoniccrystalswithadefectlayerhaveanarrowdefectmodeinthebandgap,whichcanbeusedasaverygoodfilteringmaterialbychoosingtheparametersofthedefectlayerproperly.

简介：Normally,itisdifficulttodirectlymeasurethebandgapsofperovskitebasedonmethylammonium（MA）orformamidinium（FA）athightemperaturesduetomaterialdecomposition.Wepreventthedecompositionbykeepingthesynthesizedperovskitefilms（MAPbI3andMAPbI3）inorganiciodidevapors,thenmeasurethein-situresistanceofthefilmsatvariedtemperatures,andfurtherevaluatethebandgapsofthesetwomaterials.Theevaluatedbandgapsareconsistentwiththeresultsfromultraviolet-visible（UV-vis）absorptionspectrum.ThebandgapofMAPbI3decreaseswithtemperatureabove95℃,whereasthatofFAPbI3firstincreaseswithtemperaturefrom95℃to107℃andthendecreaseswithtemperatureabove107℃.

简介：Lanthanidehasattractedmuchattentioninthefieldofopticalcommunicationsinrecentyears.SomepropertyanalysesonopticalwaveguideofNd-dopedcrystalNdxY1-xAl3(BO3)4andNd:MgO:LiNbO3aremadeinthispaper,followedbyintroductionofthemethodsofexperimentationandtheoreticalcalculationfortheplanaropticalwaveguides.Therefractiveindexprofilesoftheopticalwaveguidesareanalyzed.Theaboveworkoffersusefulinformationforstudyonnewtypematerialsforopticalcommunications.