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简介：Inthispaper,anultrathinmetalenshasbeenproposedbasedonaholographicmetasurfacethatconsistsofelongatedaperturesin40nmgoldfilm,whichexhibitintriguingpropertiessuchason-andoff-axisfocusingandalsocanconcentratelightintomultiple,discretespotsforcircularlypolarizedincidentlights.First,thespatialtransmissionphasedistributionsofthedesignedmetalenswitharbitraryfocusingcanbeobtainedbycomputergeneratedholography.Then,thediscretephasedistributionscanbecontinuouslyencodedbysubwavelengthnanoapertureswithspatiallyvaryingorientationsingoldfilm.Thesimulationresultsshowthatourdesignedmetalenscanworkefficientlyfordifferenttypesoffocusing.Finally,ourmetasurfaceshowssuperiorbroadbandcharacteristicsbetween670and810nm,andthecorrespondingfocallengthsofthedesignedlensesalsocanbeefficientlymodulatedwiththeincidentlightsatdifferentwavelengths.

简介：Asimplifiedmathematicalmodelwascreatedformeasurementofthermalexpansioncoefficientsofthinsheetmaterialswithholographictechnique.Experimentalset-upscorrespondingtothemathematicalmodelweredesignedandbuiltforbothtestsaboveroomtemperatureandatlowtemperatures.Afringecontroltechniquewasintroducedforlowtemperaturemeasurementstocompensaterigidbodymovement,THinsheetspecimensofsiliconandaluminumalloy(7075)weretestedwiththedevelopedtechnique.Thetestedresultsareingoodagreementwithreporteddataandthusverifythevalidityofthedevelopedtechnique.TheThermalexpansioncoefficientsofthetestedmaterialsrangedfrom2.5×10^-60C^-1to23.6×10^-6oC^-1.

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简介：Wepresentadigitalholographicmicroscopewhereinthesampleisilluminatedbystructuredlighttoenablethecaptureofadditionalobjectspatialfrequencies.ReconstructedimageswithincreasedspatialresolutionareobtainedbyseparatingandsynthesizingbandwidthsofdifferentfrequencyregionsintheFourierdomain.Thetheoreticalanalysisandexperimentalresultsarepresented.

简介：Inordertofindtherelationshipsbetweenthedistortionruleoftheconcreteanditssurroundingstressfield,areal-timeopticalholographicsetupisusedtorecordthedistributionandthevariationofthesamples,thewaveformsofultrasonicemissionstimulatedbythemicro-cracksarerecordedbyatransientautomaicwaveformrecorderthdeterminethetime,locationandintensityoftheactionsofmicro-cracks,Theexperimentresultsareworthystudying.Thismethodprovidesausefulexperimentalapproachtostudythebrittlenessmaterials.

简介：Thetomographytechniqueiscommonlyusedforthereconstructionofholographicinterferometry.However,thecurrentreconstructionmethoddoesn'tconsiderthemeasurementerrorswhicharenon-avoidableinthemeasurementandwilldegradethereconstructionquality.Thefactorsaffectingthereconstructionqualityareanalyzedandthedistributionlawofthereconstructionerrorwithexperimentalerrorsisdiscussed.Finally,amethodtoimprovethereconstructionquality—theKalmanfiltermethodispresented.

简介：Laguerre–Gaussianbeams,asaspecialmodelwithspiralphasestructure,havebeenintensivelyinvestigated.HolographicgratingmethodisaconvenientmethodofgeneratingLaguerre–Gaussianbeamsandmeasuringtheirorbitalangularmomenta.Butduetosomeinevitableadversefactorssuchaslateraldisplacement,angulardeflectionandellipticalincidentprofileofincidentbeam,thepracticaleffectivenessshouldbereevaluated.Thispaperisdevotedtothestudyontheinfluencesoftheabovementionedthreeadversefactorsontheholographicgratingmethod.Thecharacteristicsofthemodedecompositionofdiffractiveorderandtherelativepowersoftheorbitalangularmomentumeigen-statesarealsogiven.

简介：Anon-axisholographiczoneplateoranoff-axisholographiczoneplateusedforthesiliconsolarcellwillhaveasolarenergyconversionfactorof2.5.Andthecombinationofthetwoplateswillhaveitsconversionfacftorof5.Especiallyfortheuseofsilverhalidephotographicemulsion,thecostcanbecutdowndramatically.

简介：Itiswellknownthatopticaltomographycanaccuratelyandquantitativelyre-constructtherefractiveindexfieldofatransparentmediumanddisplaythethreedimensionalimageofotherthysicalquantitiesrelevanttotemperatureordensity.Inthispaper.anewmultidirectionalholographicinterferometricsystemisbuilt,andtwokindsofimagetecon-structionalgoritmaareintroducedandanautomaticimageprocessingsystemofinterfero-gramisdesigned.Athreedimentsionalasymmetricgadflowfieldaboveacombustorisexperi-mentallyinvestigatedwithholographicinterferormetry.Thereconstructedtemperaturesaresimilartothosemeasuredwithathermocouple.

简介：我们使用对扩大holographicRicci黑暗精力(ERDE)诊断的statefinder模型没有并且与到学习的相互作用他们的行为。我们为不同盒子阴谋各种各样的参数的轨道。非交往的模型不到达LCDM点，这被显示出{1，0}并且因为相互作用做statefinder对的进化，交往的被赞成{r，s}相当不同。

简介：Inholographicencryption,doublerandom-phaseencodingintheFresneldomain(DRPEiFD)isaprevalentencryptionmethodbecauseitislenslessandsecure.However,noisesbringadverseeffectsduringdecryption.Inthisletter,weintroducequick-response(QR)codingduringencryptiontoresistnoises.WetransformtheoriginalinformationintoaQRcodeandthenencryptthecodeasahologramthroughDRPEiFD.Toretrievetheinput,wedecryptthehologramintheoppositemannertotheencryptionandsubsequentlyobtainaQRcodewithnoises.Byscanningthiscodewithproperapplicationsinsmartphones,wecanobtainanoise-freeretrieval.Numericalexperimentsandimagesscannedbyasmartphoneareshowntovalidateourproposedmethod.

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简介：Inordertoimprovetheresolutionofdigitalholographywithacommon-dimensioncharge-coupleddevice（CCD）sensor,thepointspreadfunctionsarebrieflyderivedforthecommonlyusedandpracticalpost-magnification,pre-magnification,andimage-planedigitalholographicmicroscopicsystems.Theultimateresolutionsofthesesystemsareanalyzedandcompared.Theresultsshowthattheultimatelateralresolutionofpre-magnificationdigitalholographyissuperiortothatofpost-magnificationdigitalholographyinthesameconditions.Wealsodemonstratethattheultimatelateralresolutionofimage-planedigitalholographyhasnocorrelationwiththephotosensitivedimensionoftheCCDsensor,anditisnotsignificantlyrelatedtothepixelsizeofthesensor.Moreover,boththeultimateresolutionandtheimagingqualityofimage-planedigitalholographyaresuperiortothatofpre-andpost-magnificationdigitalholographicmicroscopy.High-resolutionimaging,whoseresolutionisclosetotheultimateresolutionofthemicroscopeobjective,canbeachievedbyimage-planedigitalholographyevenwithasubmillimeter-dimensionsensor.Thissystem,bywhichperfectimagingcanbeachieved,isoptimalforcommonlyuseddigitalholographicmicroscopy.Experimentalresultsdemonstratethecorrectnessofthetheoreticalanalysis.

简介：ResearchdemonstratesthataFresnelhologramcanbegeneratedandsimultaneouslyencryptednumericallybasedonasecretsymmetrickeyformedbythemaximallengthsequence(M-sequence).Themethodcanbedirectlyextendedtoencryptavideoholographicclipinaframe-by-framemanner.However,giventhelimitedcombinationofsignalsinthefamilyofM-sequence,hackingthesecretkeythroughtrialanderrorcanbetimeconsumingbutnotdifficult.Inthisletter,weproposeamethodthatisdifficulttocrackwithbruteforceforencryptingaholographicvideosequence.AnM-sequenceisfirstrandomlyassignedtoencrypteachframeoftheholographicvideosignal.Subsequently,theindexoftheselectedM-sequence,whichisnecessarytodecryptthehologram,isencryptedwiththeRSAalgorithmbeforetransmittingtothereceivingend.Atthereceivingend,thedecoderisprovidedwithaprivatekeytorecovertheindexforeachframe,andthecorrespondingM-sequenceisusedtodecrypttheencodedhologram.

简介：Twodifferentmethodsfromgraphicprocessingunit(GPU)andcentralprocessingunit(CPU)areproposedtosuitablyoptimizelook-uptablealgorithmsofcomputergeneratedholography(CGH).Thenumericalsimulationsandexperimentalresultsshowthatwecanreconstructagoodqualityobject.ThecomputationofCGHforathree-dimensional(3D)dynamicholographicdisplaycanalsobespedupbyprogrammingwithourproposedmethod.Itcanoptimizebothfileloadingandtheinlinecalculationprocess.Thephase-onlyCGHwithgigabytedataforreconstructing10MBobjectsamplingsisgenerated.Inaddition,theproposedmethodeffectivelyreducedtimecostsofloadingandwritingofflinetablesonaCPU.ItisbelievedtheproposedmethodcanprovidehighspeedandhugedataCGHfor3Ddynamicholographicdisplaysinthenearfuture.