简介：Anintelligentmethodforimprovingpositionlinearityofposition-sensitivedetector(PSD),basedonsupportvectormachines(SVMs),isdeveloped.TheSVMisestablishedbasedonthestructuralriskminimizationprincipleratherthanminimizingtheempiricalerrorcommonlyimplementedinneuralnetworks.SVMcanachievehighergeneralizationperformance.TrainingSVMisequivalenttosolvingalinearlyconstrainedquadraticprogrammingproblem,thusthesolutionofSVMisalwaysuniqueandgloballyoptimal.Theimprovingpositionlinearityprocedurehasbeenillustratedusingatwo-dimensional(2D)PSD.ItispointedoutthatthepositionlinearityofthemeasuringsystemwithaproperSVMcorrectionisimprovedbytwoordersofmagnitudeinthemeasurementrange.

简介：Aperiodiclayeredmedium,withunitcellsconsistingofadielectricandanelectromagnetically-inducedtransparency(EIT)-basedatomicvapor,isdesignedforlightpropagationmanipulation.Consideringthatadestructivequantuminterferencerelevanttoatwo-photonresonanceemergesinEIT-basedatomsinteractingwithbothcontrolandprobefields,anEIT-basedperiodiclayeredmediumexhibitsaflexiblefrequency-sensitiveopticalresponse,whereaverysmallvariationintheprobefrequencycanleadtoadrasticvariationinreflectanceandtransmittance.ThepresentEIT-basedperiodiclayeredstructurecanresultincontrollableopticalprocessesthatdependsensitivelyontheexternalcontrolfield.Thetunableandsensitiveopticalresponseinducedbythequantuminterferenceofamulti-levelatomicsystemcanbeappliedinthefabricationofnewphotonicandquantumopticaldevices.Thismaterialwillalsoopenagoodperspectivefortheapplicationofsuchdesignsinseveralnewfields,includingphotonicmicrocircuitsorintegratedopticalcircuits.

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.