简介：

简介：Therelativebandgapforarhombuslatticephotoniccrystalisstudiedbyplanewaveexpansionmethodandhighfrequencystructuresimulator(HFSS)simulation.GeneralwavevectorsinthefirstBriliouinzonearederived.Therelativebandgapasafunctionofair-fillingfactorandbackgroundmaterialisinvestigated,respectively,andthenatureofphotonicbandgapfordifferentlatticeanglesisanalyzedbythedistributionofelectricenergy.Theseresultswouldprovidetheoreticalinstructionfordesigningopticalintegrateddevicesusingphotoniccrystalwitharhombuslattice.

简介：Wefocusonthefullrelativisticquantummechanicalcalculationsfromborontofluorineatomswithelectronicconfigurationof1s22s22pn(n=1,2,3,4,and5),where1s22s2istheclosedshelland2pnistheopenshell.Theiractiveelectronsintheopenshelloccupyallthesixspinorsasfaraspossible.Therefore,wesuggestanewrulecalled'maximumprobability'forthefullsymmetrygrouprelativistictheory.Furthermore,thespectralfinestructureoftheatomicgroundstatesbasedonthefullrelativistictheoryandtheirintervalsofL-Ssplittingareallreasonable.ItisimpossibletocalculatetheL-Ssplittingthroughnon-relativisticquantummechanics.Therelativisticeffectofatomicmassisincreasedsignificantlybyabout12foldsfromboronatomtofluorineatom.

简介：Applicabilityofguidedmoderesonantstructurestotunableopticalfilteringandsensingisdemonstratedusingnematicliquidcrystals.Asasensor,aminimumrefractiveindexdetectivityof10-5isdemonstratedwhileasatunablefilter,tunabilityrangeoffewtensofnanometerswith2-nmbandwidthispresented.Theoptimumdesignisachievedbymaximizingtheevanescentfieldregionintheanalytewhichmaximizestheoverlapintegral.Thedevicecanbeoperatedinreflectionortransmissionmodesatnormalincidence.Itcanalsobeoperatedatasinglewavelengthbymeasuringtheangularprofileofthelightbeam.

简介：AnovelInGaAs/InAlAscoupledquantumwellstructureisproposedforlargefield-inducedrefractiveindexchangewithlowabsorptionloss.Inthecaseoflowappliedelectricfieldof15kV/cmandlowabsorptionloss(±≤100cm-1),alargefield-inducedrefractiveindexchange(fortransverseelectric(TE)mode,△n=0.012;fortransversemagnetic(TM)mode,△n=0.0126)isobtainedinthestructureattheoperationwavelengthof1.55μm.Thevalueislargerbyoveroneorderofmagnitudethanthatinarectangularquantumwell.Theresultisveryattractiveforsemiconductoropticalswitchingdevices.

简介：Athree-dimensionalmodelofGaAs/A1GaAsquantumdoubleringsinthelateralstaticelectricfieldisinvestigatedtheoretically.Theeigenvalueproblemwiththeeffective-massapproximationissolvedbymeansofthefinite-elementmethod.Theenergylevelsandwavefunctionsofquantum-confinedelectronsandheavyholesareobtainedandshowanagreementwithourprevioustheoreticalandexperimentalstudies.ItisshownintheapproximationofneglectingtheCoulombattractionbetweentheelectronandheavyholethatarelativelylargeStarkshiftofexcitonemissionof4meVisattainablewithanappliedelectricfieldof0.7kV/cm.

简介：Anovelnonlinearopticalloopmirror(NOLM)withanonreciprocalphaseshiftbias(NPSB),calledpowerequalizationNOLM(PE-NOLM),isproposedforreducingthepowerfluctuationofpulsetrains.NPSBprovidespartofthenonreciprocalphasedifferencesothattherequiredinputpowerisreduced,andnonsymmetricalcouplingratioofcouplercanadjustthetransmissioncurvetoimprovetheequalizationrange.IthasbeenshowntheoreticallythatcomparedwithearlierPE-NOLM,about1.6dBofequalizationpowerreductionandabout2.2dBofequalizationrangeenhancementcouldbeachieved.Experimentshavedemonstratedthattheoutputpowerfluctuationisreducedtolessthan0.4dB,whiletherequiredinputpeakpowerrangeis4.5dBm(15.6-20.1dBm).

简介：WedesignaD-shapedfiberopticbiosensorbasedonthesurfaceplasmonresonance(SPR)ofametal-graphenelayerandsimulatethisSPRusingthefiniteelementmethod.Usingametal-graphenelayerasthesensingmaterial,surfaceplasmaresonanceissimulatedastherefractiveindexoftheexternalenvironmentrangesfrom1.33to1.36.Simulationresultsshowthatametal-graphenelayerattachedtotheD-shapedopticalfibercorecancouplewithlightunderaspecificpolarizationstateandexcitestrongplasmaoscillationsonthelayersurface.Calculatedtransmissioncoefficientsshowthattheresonancewavelengthobviouslymovestowardlongerwavelengthsastherefractiveindexofthetestmediumincreases,andasensitivityof5400nm/RIUisobtained.Becauseofitslargesurfacevolumeratioandgoodbiocompatibility,graphenemaybeutilizedinmanyapplicationsinthefieldofbiosensing.

简介：FourkindsofY2O3stabilizedZrO2(YSZ)thinfilmswithdifferentY2O3contents(from0to12mol%)aredepositedonBK7glasssubstratesbyelectron-beamevaporationmethod.TheeffectsofdifferentY2O3dopantcontentsonresidualstress,structure,andopticalpropertiesofZrO2thinfilmsareinvestigated.TheresultsshowthatresidualstressinYSZthinfilmsvariesfromtensiletocompressivewiththeincreaseofY2O3molarcontent.TheadditionofY2O3isbeneficialtothecrystallizationofYSZthinfilmandtransformationfromamorphoustohightemperaturephase,andtherefractiveindexdecreaseswiththeincreaseofY2O3molarcontent.Moreover,thevariationsofresidualstressandtheshiftsofrefractiveindexcorrespondtotheevolutionofstructuresinducedbytheadditionofY2O3.