简介：Amethodofdetectingdry,icyandwetroadsurfaceconditionsbasedonscanningdetectionofsinglewavelengthbackwardpowerisproposedinthisletter.Thedetectorisusedtoreceivethebackwardscatteredpowerwhichchangeswiththeincidenceangle.Therelationshipbetweenbackwardpowerandincidenceangleisusedtofindouttheeffectiveanglerangeanddistinguishmethod.Experimentandsimulationshowthatitisfeasibletoclassifythesethreeconditionswithinincidenceangleof5.3degree.

简介：本刊讯强场非顺序双电离包含了丰富的物理过程，最重要的是为研究电子关联效应提供了一个简单清晰的模型，因而成为当前强场物理领域研究的热点。在分子与强场的相互作用过程中，电离和解离会同时发生。实验和理论研究表明核间距的变化会对分子电离产生重要影响。

简介：Anintracavityfrequency-doubledverticalexternalcavitysurfaceemittinglaser(VECSEL)withgreenlightisdemonstrated.ThefundamentalfrequencylasercavityconsistsofadistributedBraggreflector(DBR)ofthegainchipandanexternalmirror.A12-mWfrequency-doubledoutputhasbeenreachedat540nmwithanonlinearcrystalLBOwhenthefundamentalfrequencyoutputis44mWat1080nm.Thefrequencydoublingefficiencyisabout30%.

简介：Specularandstrongreflectionsarethemainproblemsencounteredduringpartimagedefectinspectionofshinyorhighlyreflectivesurfaces.Inthisletter,weproposeanimprovedilluminationmethodfordefectinspection.Adiffuselightsourceisdesignedbasedonthephysicsanalysisoflightreflection.Thedistributionofintensityissimulatedaccordingtoaknownmodeltoverifytheilluminationuniformityofthesource.Experimentsshowthatdefectexpressivitywhenusingtheproposedilluminationmethodhasabetterperformance.Theopticalmodelisnotonlysuitableforthedefectdetectionofmetalballsbutalsoforthedefectdetectionofplanesandcylinders.

简介：Anopticalfibersensorforultrathinlayersensingbasedonshort-rangesurfaceplasmonpolariton(SRSPP)isproposed,andthesensingcharacteristicsaretheoreticallyanalyzed.Simulationresultsindicatethatevenforadetectinglayermuchthinnerthanthevacuumwavelength,aresolutionashighas3.7×10-6RIUcanbeobtained.Moreover,anaveragethickness-detectionsensitivityof6.2dB/nmisobtained,whichenablesthesensortodetectthethicknessvariationoftheultrathinlayeruptotensofnanometers.Thesensitiveregionofthicknesscouldbeadjustedbytuningthestructureparameters.

简介：Influenceoftemperatureonmeasurementofsurfaceplasmonresonance(SPR)sensorwasinvestigated.SampleswithvariousconcentrationsofNaClweretestedatdifferenttemperatures.Itwasshownthatiftheaffectionoftemperaturecouldbeneglected,measurementprecisionofsaltsolutionwas0.028wt.-%.Butmeasurementerrorofsalinityca,usedbytemperaturewas0.53wt.-%inaveragewhenthetemperaturedriftwas1℃.Toreducetheerror,adouble-cellSPRsensorwithsaltsolutionanddistilledwaterflowingrespectivelyandatthesametemperaturewasimplemented.更多还原

简介：InordertoimprovetheopticalpropertiesoftheⅢ-Ⅴlaserdiodes(LDs)bymeansofH_2Splasmapassiva-tiontechnology,H_2SplasmapassivationtreatmentisperformedontheGaAs(110)surface.Theoptimumpassivationconditionsobtainedare60-Wradiofrequency(RF)powerand20-minduration.Sothelasercavitysurfacesaretreatedundertheoptimumpassivationconditions.Consequently,comparedwithun-passivatedlaserswithonlyAR/HR-coatings,thecatastrophicopticaldamage(COD)thresholdvalueofthepassivatedlasersbyH_2Splasmatreatmentisincreasedby33%,whichisalmostthesameasthatof(NH_4)_2S_xtreatment.Andthelife-testexperimenthasdemonstratedthatthispassivationmethodismorestablethan(NH_4)_2S_xsolutionwet-passivatedtreatment.

简介：磁性的液体(MF)充满了的高敏感方面洞纤维磁场传感器基于表面电浆子，回声(SPR)被设计并且调查。在方面洞纤维以内，以水为基的MF被注入二个方面洞，并且两洞与黄金是涂的由使用SPR效果认识到磁场的测量。MF的折射索引随着不同外部磁场变化，导致搬到另外的波长的反响的波长。而且，当外部磁场从30～210.9Oe增加时，磁场敏感能到达nm/Oe到1.063。

简介：Weinvestigatethesensitivityenhancementofsurfaceplasmonresonance(SPR)sensorsthroughplanarmetallicfilmcloselycoupledtonanogratings.Theeffectsofthethicknessofmetallicfilmandgratingperiodontherefractiveindexsensitivityofthedeviceareanalyzedindetail.Therefractiveindexsensitivityofnanograting-basedSPRsensorsispredictedtobeabout540nmperrefractiveindexunit(RIU)usingoptimizedstructuralparameters.Furthermore,thegratingperiodcanbeusedasaparametertoadjustthewavelengthofresonancereflection.OurstudyonSPRsensorsthroughplanarmetallicfilmcloselycoupledtonanogratingsdemonstratesthepotentialforsignificantimprovementinrefractiveindexsensitivity,sinceitshowsmuchgreaterflexibilityintermsoftuningtheopticalparametersofthedevice.

简介：ThisLetterreportstheformationofperiodicsurfacestructuresonNi–Fefilmirradiatedbyasinglefemtosecondlaserpulse.Aconcavelenswithafocuslengthof-150mmisplacedinfrontofanobjective(100×,NA=0.9),whichtransformstheGaussianlaserfieldintoaringdistributionbytheFresneldiffraction.Periodicripplesformontheablationareaaftertheirradiationofasinglefemtosecondlaserpulse,whichdependsonthelaserpolarizationandlaserfluence.Weproposethattheringstructureofthelaserfieldleadstoasimilartransientdistributionofthepermittivityonthesamplesurface,whichfurtherlaunchesthesurfaceplasmonpolaritons.Theinteractionoftheincidentlaserwithsurfaceplasmonpolaritonsdominatestheformationofperiodicsurfacestructures.

简介：OpticalmethodsandMTTmethodareusedtocharacterizetheantiproliferationeffectofantitumordrug9-aminoacridine(9AA)withandwithoutsilvernanoparticles.IntracellularsurfaceenhancedRamanscattering(SERS)spectraandfluorescentspectraof9AAindicatetheformof9AAadsorbedonthesurfaceofsilvernanoparticles.AlthoughbothsilvernanoparticlesandantitumordrugcaninhibitthegrowthofHelacells,silvernanoparticlescanslowdowntheantiproliferationeffectonHelacellsatlowconcentrationofantitumordrugs.Ourexperimentalresultssuggestthatsilvernanoparticlesmayserveasslow-releasedrugcarriers,whichisimportantinantitumordrugdelivery.

简介：Atunableslowlightof2.5-Gb/spseudo-randombinarysequencesignalusinga1550-nmvertical-cavitysurface-emittinglaser(VCSEL)isexperimentallydemonstrated.Theinfluencesofthebiascurrentandthegainsaturationontheslowlightareinvestigated.Withbiascurrentincreasing,tunableopticalgroupdelayupto98psisobtainedatroomtemperature.Demonstrationofthetimedelaybetween16and24psbysignalintensitychangeisreported.Underanappropriatebiascurrent,bytuningtheinputsignaltotrackthepeakgainwavelengthoftheVCSEL,slowlightofapowerpenaltyaslowas1dBisachieved.Withsuchalowpowerpenalty,theVCSELhasagreatpotentialapplicationasacompactopticalbuffer.

简介：Theopticalwavescatteringfromone-dimensional(1D)lossydielectricGaussianrandomroughsurfaceisstudied.ThetaperedincidentwaveisintroducedintotheclassicalKirchhoffapproximation(KA),andtheshadowingeffectisalsotakenintoaccounttomaketheKAresultshaveahighaccuracy.ThedefinitionofthebistaticscatteringcoefficientofthemodifiedKAandthemethodofmoment(MOM)areunified.ThecharacteristicsoftheopticalwavescatteringfromthelossydielectricGaussianrandomroughsurfaceofdifferentparametersareanalyzedbyimplementingMOM.

简介：Aversatileandlow-costsingle-beamself-referencedphase-sensitivesurfaceplasmonresonance(SPR)sens-ingsystemwithultra-highresolutionperformanceispresented.Thesystemexhibitsaroot-mean-squarephasefluctuationof±0.0028°overaperiodof45min,i.e.aresolutionof±5.2×10~(-9)refractiveindexunits.Theenhancedperformancehasbeenachievedthroughtheincorporationofthreedesignelements:atruesingle-beamconfigurationenablingcompleteself-referencingsothatonlythephasechangeassociatedwithSPRgetsdetected,adifferentialmeasurementschemetoeliminatespurioussignalsnotrelatedtothesensorresponse,andtheeliminationofretardationdriftsbyincorporatingtemperaturestabilizationintheliquidcrystalphasemodulator.Ourdesignshouldbringthedetectionsensitivityofnon-labelingSPRbiosensingclosertothatachievablebyconventionalfluorescence-basedtechniques.

简介：多光谱的MODIS（中分辨率成像光谱仪）数据为深入研究全球卷云提供了可能性。基于卷云辐射系统模型，利用MODIS的1．38μm波段（26通道）和0．66μm波段（1通道）探测数据的相关性，反演计算可见光波段卷云的反射率。反演计算中，使用1km分辨率的MODIS1B数据，对M（）DIS典型图幅进行不同等分的划分，分别给出反演结果并进行对比分析，结果表明等分份数越多，其反演结果的精度越高，最后给出了反演结果的实际应用。

简介：对比分析了COMS图像传感器IBIS5-A-1300的两种工作模式，使用Verilog语言对图像传感器的驱动时序进行硬件的描述，并用ModelSim对卷帘模式的设计时序进行仿真。采用了Altera公司的cycloneⅡ系列器件EP2C20F48418进行配置和验证，结果证明了时序电路的正确性。该系统适用于航天领域空间图像采集任务。

简介：提出了一种新型OCDMA多维码构造方案.该多维码是在一维EPC(扩展的素数码)时域码的基础上,对其进行PC(素数码)跳频编码,并加上了偏振信息.然后通过偏振片和FBG(布拉格光线光栅)实现这种码的编解码,详述了其特点,最后描述了使用该地址码进行信息传输的OCDMA系统结构.计算表明该新型地址码具有更大的容量,能容纳更多的用户同时通信.

简介：设计了一种基于CIS的柔性片材光电自动检测纠偏控制器，可以准确地检测出特征标志线的位置，并驱动执行机构带动切割刀片进行实时、准确的位置分切。在差动纠偏方法的基础上，采用了阈值增量法和均值边缘检测方法更精确地检测标志线的位置，并介绍了纠偏控制系统的硬件结构和软件设计。与两对光电元件为检测传感器的纠偏检测控制器相比较，该纠偏控制器具有较高的空间检测分辨率和精度。

简介：针对在无线射频识别（RFID）卡生产过程中会采用不同材质或不同颜色的柔性基板的情况，提出了一种利用CCD扫描图像灰度均值作为反馈信号来控制光源光强进行自动调节的方法，以获取不同柔性基板的高质量的特征标志线图像。给出了用FPGA实现该技术的方法，介绍了使用QuartusⅡ设计的光强自动调节电路的各个功能模块，给出了仿真验证结果，并在实验平台上对RFID柔性基板进行了实际的应用测试。该技术已成功应用在RFID卡封装设备的自动纠偏控制系统中，运作良好。

简介：提出了使用DSP对F-P腔滤波后的FBG反射谱进行信号处理的解调方案，DSP处理器不断地对测量支路和参考支路的信号进行采集、比较，从而解算出待测量的变化值。从光学原理上探讨了F-P腔用波长表示的干涉滤波函数，对光电探测器测得的信号进行反卷积模拟运算，得到了当光电探测器接收的光强度分布不是中心对称时，分别提高了0．0399nm和0．057nm的FBG反射谱，提高了光纤光栅传感器的解调精度。