简介：ThespinHalleffectoflight(SHEL)canbeobservedbythedarkstripresultingfromweakmeasurement.WefindthattheSHELofapartiallycoherentbeam(PCB)hasasimilarphenomenonaswell.However,thedarkstripintheSHELofaPCBcannotbeexplainedbyconsideringthebeamasanassemblanceofcoherentspeckles.Also,thedarkstripinaPCBisnotpurelydark.Byanalyzingtheautocorrelation,weshowthattheSHELofaPCBistheresultofoverlappingcoherentspeckles'SHEL.Wefurtherproveourconclusionbyadjustingconvergenceandincidentangles.Finally,wedevelopaqualitativetheorytoclarifytheSHELofaPCB.

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