预览加载中，请您耐心等待几秒...

THz辐射源与THz光子晶体波导的耦合研究的综述报告.docx

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

THz辐射源与THz光子晶体波导的耦合研究的综述报告 Terahertz(THz)radiationhasbecomeafocusofresearchinrecentyearsduetoitsuniquepropertiessuchaslowphotonenergy,non-ionizingradiation,andgoodpenetrationabilitythroughmanymaterialsincludingbiologicaltissues.However,thelackofefficientandcompactTHzsourceshaslimiteditswidespreaduseinpracticalapplications.ThecouplingofTHzradiationsourceswithphotoniccrystalsandwaveguideshasbeenextensivelystudiedtoovercomethislimitationandimprovetheefficiencyofTHzradiationgenerationanddetection. THzradiationsourcescanbebroadlyclassifiedintotwocategories:electronicandoptical.ElectronicsourcescomprisematerialssuchasGunndiodes,magnetrons,andSchottkydiodes,whileopticalsourcesprimarilyincludefemtosecondlasersandfree-electronlasers.Amongthesesources,thefemtosecondlaserisaparticularlyattractiveoptionduetoitssimplicity,compactness,andversatility. Overtheyears,severaltechniqueshavebeenproposedforcouplingTHzradiationsourceswithphotoniccrystalsandwaveguides.Onesuchtechniqueiscalledtheevanescent-fieldcouplingmethod,whereintheTHzradiationiscoupledfromasourceintoawaveguideorphotoniccrystalusingtheevanescentfieldthatextendsbeyondthesurfaceofthesource.Anothermethodiscalledtheresonantcouplingmethod,whereinaTHzsourceisintegratedwithaphotoniccrystalorwaveguideinsuchawaythattheTHzradiationisstronglycoupledtothephotoniccrystalorwaveguideatspecificresonantfrequencies. Photoniccrystalsareperiodicdielectricstructuresthatpossessaphotonicbandgapthatcanbetailoredtocontrolthepropagationoflight.PhotoniccrystalscanbedesignedtomanipulateTHzradiationinamannersimilartohowtheymanipulatelightinotherpartsoftheelectromagneticspectrum.TheycanbeusedtoconfineTHzradiationwithinsmallvolumesandenhancetheelectricfieldintensity,therebyincreasingtheefficiencyofTHzradiationgenerationanddetection. Waveguides,ontheotherhand,arestructuresthatcanconfineandguidelightalongaspecificpath.Therearevarioustypesofwaveguidessuchashollowwaveguides,metal-insulator-metalwaveguides,andphotoniccrystalwaveguides.Photoniccrystalwaveg