简介：由启用在大多数材料的机能上地相关的长度规模探查lightmatter相互作用，近地的光成像和光谱学存取与另外的方法是不能得到的信息。无孔的技术的来临，它利用ultralocalized并且提高近地由突然地金属性的尖端或plasmonicnanoparticles创造了，为学习新奇材料和现象导致了近地的途径的快速的采纳，与接近亚molecular层次的空间分辨率。然而，这些途径由无孔的尖端的主导的out-of-plane极化反应通常是有限的，限制许多材料性质的探索和发现。这在为与近地的轻部件提高在里面飞机相互作用明确地设计的近地的尖端导致了最近的设计和制造突破。这微型评论在针对利用的最近的进步和新兴的方向上提供一个观点，加亮在哪儿的关键应用程序空格并且控制在里面飞机光极化近地的尖端回答启用了的在里面飞机在新nanostructured材料和设备的理解和开发的最近的前进。

简介：

简介：Thisworkdevelopsnear-optimalcontrolsforsystemsgivenbydifferentialequationswithwidebandnoiseandrandomswitching.Therandomswitchingismodeledbyacontinuous-time,time-inhomogeneousMarkovchain.Underbroadconditions,itisshownthatthereisanassociatedlimitproblem,whichisaswitchingjumpdiffusion.Usingnear-optimalcontrolsofthelimitsystem,wethenbuildcontrolsfortheoriginalsystems.Itisshownthatsuchconstructedcontrolsarenearlyoptimal.

简介：Wedemonstrateawidelytunablenear-infraredsourcefrom767nmto874nmgeneratedbytheintracavitysecondharmonicgeneration(SHG)inanopticalparametricoscillatorpumpedbyaYb:LYSOsolid-statelaser.Thehome-madeYb:LYSOoscillatorcenteredat1035nmdeliversanaveragepowerof2Wandapulsedurationasshortas351fs.TwoMgOdopedperiodicallypoledlithiumniobates(MgO:PPLN)withgratingperiodsof28.5–31.5μminstepsof0.5μmand19.5–21.3μminstepsof0.2μmareusedfortheOPOandintracavitySHG,respectively.Themaximumaverageoutputpowerof180mWat798nmwasobtainedandtheoutputpulseshavepulsedurationof313fsat792nmifasech2-pulseshapewasassumed.Inaddition,tunablesignalfemtosecondpulsesfrom1428nmto1763nmarealsorealizedwiththemaximumaveragepowerof355mWat1628nm.

简介：Wenumericallydemonstrateanovelultra-broadbandpolarization-independentmetamaterialperfectabsorberinthevisibleandnear-infraredregioninvolvingthephase-changematerialGe2Sb2Te5（GST）.Thenovelperfectabsorberschemeconsistsofanarrayofhigh-indexstrong-absorbanceGSTsquareresonatorsseparatedfromacontinuousAusubstratebyalow-indexlosslessdielectriclayer（silica）andahigh-indexGSTplanarcavity.Threeabsorptionpeakswiththemaximalabsorbanceupto99.94%areachieved,owingtotheexcitationofplasmon-likedipolarorquadrupoleresonancesfromthehigh-indexGSTresonatorsandcavityresonancesgeneratedbytheGSTplanarcavity.Theintensitiesandpositionsoftheabsorptionpeaksshowstrongdependenceonstructuralparameters.AheattransfermodelisusedtoinvestigatethetemporalvariationoftemperaturewithintheGSTregion.TheresultsshowthatthetemperatureofamorphousGSTcanreachupto433Kofthephasetransitiontemperaturefromroomtemperatureinjust0.37nswitharelativelylowincidentlightintensityof1.11×108W∕m2,duetotheenhancedultra-broadbandlightabsorbancethroughstrongplasmonresonancesandcavityresonanceintheabsorber.Thestudysuggestsafeasiblemeanstolowerthepowerrequirementsforphotonicdevicesbasedonathermalphasechangeviaengineeringultra-broadbandlightabsorbers.