简介:Inthispaper,thephotonicbandgapofphotoniccrystalswithchiralandnegative-indexmaterialsalternatelyisinvestigated.Itisshownthatthiskindofphotoniccrystalexhibitsverywidephotonicbandgap.Thephotoniccrystalswithadefectlayerhaveanarrowdefectmodeinthebandgap,whichcanbeusedasaverygoodfilteringmaterialbychoosingtheparametersofthedefectlayerproperly.
简介:Theultra-compactbiosensorbasedonthetwo-dimensional(2D)photoniccrystal(PhC)microcavityisinvestigated.TheperformancesofthesensorareanalyzedtheoreticallyusingtheFabry-Perot(F-P)cavitymodelandsimulatedusingthefinite-differencetime-domain(FDTD)method.Thesimulationresultsgoalongwiththetheoreticalanalysis.
简介:有在短波长区域的异常分散的Photonic水晶纤维(PCF)为一些应用是重要的,例如短波长soliton繁殖,超级连续统产生和放射激光的短脉搏纤维。在这份报纸,为与要求的异常分散区域设计PCF的一个系统的方法被使用一个有限差别解答者和PCF的波导分散的可伸缩的转变建议。设计PCF能在这个区域是反常地散的不到1.3渭m,它是很困难的在传统的标准单个模式的纤维认识到。建议方法的有效性被数字结果同意。CLC数字TN253-TQ342+.82文件代码A这个工作被中国(号码60407011和号码60277018)和浙江的国家自然科学基础支持中国的省的自然科学基础(没有。Y104073)
简介:与NOLM切换的微波photonic上的XPM的影响被能解决联合非线性的Schr的裂口步Fourier方法(SSFM)分析?dinger方程(CNLSE)。模拟结果证明XPM导致波形的失真和方面脑叶的漏缝。并且调整带宽越大,方面脑叶的漏缝是越多larger。而且,因为导致XPM的nonreciprocity,NOLMTm的力量传播功能被弄歪:当时,Tm减少couplerf鈭?的切开的比率0,0.5)并且增加什么时候f鈭?0.5,1)。CLC数字O451这研究被中国(号码60272048)的国家科学基金支持,为上海的优秀教师讲师的特殊科学基础。
简介:InPintegratedphotonicshasbecomeacriticalenablerformoderntelecommunications,andispoisedtorevolutionizedatacommunications,precisionmetrology,spectrometry,andimaging.Thepossibilitytointegratehigh-performanceamplifiers,lasers,modulators,anddetectorsincombinationwithinterferometerswithinonechipisenablinggame-changingperformanceadvances,energysavings,andcostreductions.Genericintegrationacceleratesprogressthroughtheseparationofapplicationsfromacommontechnologydevelopment.Inthispaper,wereviewthecurrentstatusinInPintegratedphotonicsandtheeffortstointegratethenextgenerationofhigh-performancefunctionalityonacommonsubstrateusingthegenericmethodology.
简介:Weproposeanddemonstrateanultrasensitiveintegratedphotoniccurrentsensorthatincorporatesasiliconbasedsingle-mode-multimode-single-modewaveguide(SMSW)structure.ThiskindofSMSWstructureisplacedoveradirectcurrentcarryingpowerresistor,whichproducesJoule’sheattochangethetemperatureoftheSMSWandfurtherresultsinthechangeoftheeffectiverefractiveindexbetweendifferentpropagatingmodes.Interferenceoccurswhenthemodesrecombineatthesecondsinglemodewaveguide.Finally,thecurrentvariationismeasuredbymonitoringtheshiftintheoutputspectrumofthemultimodeinterferometer.Inlowcurrent,thewavelengthshifthasalmostlineardependence:Δλ∝Ic.Thiseffectcanbeusedasacurrentsensorwithaslopeefficiencyof4.24nm/Aintherangeof0–200mA.
简介:与缺点多层的分数维的领唱者的二新奇结构被介绍。光传播矩阵方法被用来计算发射度和反射。与一般领唱者相比多层,这些新奇结构有更宽的stopbands并且在更宽的stopbands的中间给超级狭窄的乐队看,它能被用作超级狭窄的通带过滤器。当在领唱者有一个嵌入的缺点时,通行证乐队能是1530nm的红外线的波长附近的不到0.6nm多层。在中央波长的光传播比99%高,它意味着一很低插入损失。如果有三层,三座超级狭窄的山峰能在stopband的中间被发现。中央波长是分别地1232.4nm,1372.8nm和1538.3nm。它比其它种狭窄的乐队过滤器好一些,它可以在光通讯被使用。CLC数字O482.3这个工作被国家科学基金支持(60577043),上海教育委员会(217608)的发展基础和上海领先的大学教师惩罚工程(T0102)。
简介:Theoff-planepropagationofelectromagnetic(EM)wavesinatwo-dimensional(2D)graphitephotoniccrystalstructurewasstudiedusingtransfermatrixmethod.Transmissionspectracalculationsindicatethatsucha2Dstructurehasacommonbandgapfrom0.202to0.2035c/aforbothHandEpolarizationsandforalloff-planeanglesform0°upto90°.Thepresenceofsuchanabsolutebandgapimpliesthat2Dgraphitephotoniccrystal,whichismucheasierandmorefeasibletofabricate,canexhibitsomepropertiesofathree-dimensional(3D)photoniccrystal.
简介:Wereviewcurrentsiliconphotonicdevicesandtheirperformanceinconnectionwithenergyconsumption.Fourcriticalissuesareidentifiedtolowerenergyconsumptionindevicesandsystems:reducingtheinfluenceofthethermo-opticeffect,increasingthewall-plugefficiencyoflasersonsilicon,optimizingenergyperformanceofmodulators,andenhancingthesensitivityofphotodetectors.Majorconclusionsare(1)Mach–Zehnderinterferometer-baseddevicescanachieveathermalperformancewithoutanyextraenergyconsumptionwhilemicroringsdonothaveanefficientpassiveathermalsolution;(2)whiledirectbondedIII–V-basedSilaserscanmeetsystempowerrequirementfornow,hetero-epitaxialgrownIII–Vquantumdotlasersarecompetitiveandmaybeabetteroptionforthefuture;(3)resonantmodulators,especiallycouplingmodulators,arepromisingforlow-energyconsumptionoperationevenwhenthepowertostabilizetheiroperationisincluded;(4)benefitingfromhighsensitivityandlowcost,Ge/Siavalanchephotodiodeisthemostpromisingphotodetectorandcanbeusedtoeffectivelyreducetheopticallinkpowerbudget.Theseanalysesandsolutionswillcontributetofurtherloweringenergyconsumptiontomeetaggressiveenergydemandsinfuturesystems.
简介:Anoverviewoftheprogressonpulse-preserving,coherent,nonlinearfiber-basedsupercontinuumgenerationispresented.Thecontextencompassesvariouswavelengthrangesandpumpsources,startingwithsilicaphotoniccrystalfiberspumpedwith1.0μmfemtosecondlasersuptochalcogenidestep-indexandmicrostructuredfiberspumpedfromopticalparametricamplifierstunedtomid-infraredwavelengths.Inparticular,silicaandsilicatebasedall-normaldispersion(ANDi)photoniccrystalfibershavebeendemonstratedforpumpingwithfemtosecondlasersoperatingat1.56μmwiththerecordedspectracovering0.9–2.3μm.Thismatchesamplificationbandsofrobustfiberamplifiersandfemtosecondlasers.Thereviewthereforefocusesspecificallyonthiswavelengthrange,discussingglassandnonlinearfiberdesigns,experimentalresultsonsupercontinuumgenerationuptothefundamentallimitofoxideglassfibertransmissionaround2.8μm,andvariouslimitationsofsupercontinuumbandwidthandcoherence.Specifically,theroleofnonlinearresponseagainsttheroleofdispersionprofileshapeisanalyzedfortwodifferentsoftglassANDifiberspumpedatmorethan2.0μm.Aspatio-temporalinteractionofthefundamentalfibermodewithmodespropagatinginthephotoniclatticeofthediscussedANDifibersisshowntohavepositiveeffectsonthecoherenceofthesupercontinuumatpumppulsedurationsof400fs.Finally,thedesignanddevelopmentofgraded-index,nanostructuredcoreopticalfibersarediscussed.Insuchstructuresthearbitraryshapingofthecorerefractiveindexprofilecouldsignificantlyimprovetheengineeringflexibilityofdispersionandeffectivemodeareacharacteristics,andwouldbeaninterestingplatformtofurtherstudytheintermodalinteractionmechanismsandtheirimpactonsupercontinuumcoherenceforsubpicosecondlaserpumpedsetups.