太赫兹终结本

TerahertzRangeCommunicationShaoxuanWangIVEM1461003.AnexperimentofTHzcommunication1.TheintroductionofTHz2.TheapplicationsofTHzContent4.ThecommercialproductsofTHzTHEINTRODUCTIONOFTHZ“Terahertzradiationoccupiesamiddlegroundbetweenmicrowavesandinfraredlightwaves，itsfrequencyrangeisfrom0.3THz~3THz,wavelengthsofradiationintheterahertzbandcorrespondinglyrangefrom1mmto0.1mmandtechnologyforgeneratingandoperatingitisinitsinfancy，soitisaemergingdisciplineinthephysics.Figure1:Thelocationofterahertzregioninelectromagneticspectrum[1]10310610910121015101810211024100MF，HF，VHF，UHF，SHF，EHF微波可见光kilomegagigaterapetaexazettayottax-射线g–射线THz间隙Hz频率(Hz)1THz~1ps~300µm~33cm-1~4.1meV~47.6KdcclassicaltransportquantumtransitionFigure2.ApplicationofTHz[6]THZIMAGEOFSECURITYFigure2：THzimaginginthesecurity[7]THzapplicationinMedicineFigure3：THzimagining（aandb)andabsorptioncoefficientimagesofthesamples:(candd)[8]Xi-ChengZhangShortBiographyDr.ZhangwastheProfessorandActingHeadoftheDepartmentofPhysicsinUniversityofRochester,professorZhang'sresearchinterestscenteraroundTerahertzwaves.Hisresearchisfocusedonthegeneration,detection,andapplicationsoffree-spaceTHzbeamswithultrafastoptics[9].JianquanYaoBiographyLaserandNon-LinearityExpert,DirectoroftheChineseOpticalSociety.ProfessorYaoJianquanhaslongbeenengagedintheresearchofnonlinearopticalfrequencylaserandconvertertechniques[10].Figure4:ThisisadiagramofTHzgenerator[12]Cbandlaserisawavelengthbetween1530and1565nm[11];UTC-PDisadevicethatcangenerateCWTHzradiationandmakethebestuseofthetelecom-basedtechnology(1550nm)[16].Figure5.0.14THz10Gbpswirelesscommunicationsystem[12]Atfirstweencodethe10Gbpsdataatthetransmitter,thenthesignalismodulatedbythedeviceof16QAM,whichisadigitalmodulatedconversion.Finallythesignalisconvertedtoacarrierfrequencyof6GHzandthebandwidthof3.6GHz,andtheweusetheKaLogeneratortochangethesignal’sfrequencyintoabout133.8GHz,thelastweemitthesignalbyaantenna.Thereceiverprocessisoppositetothetransmitter[12].Figure6:Performanceof0.14transmitterandreceiver[10]Thecorecomponentoftransmitterandreceiveristhe0.14THzsub-harmonicmixer,whichisadevicebasedonSchottkydiode.Figure8:500mdistance10Gbpstransmissiontest[12]Figure9:500mdistance10Gbpswirelesscommunicationexperiment[12]THzcommercialproductsTHztechnologywillhaveastrongcompetitiveedgeintheITfield.Fromnowon,therearemanycompaniesengagedinworkrelatedtothecommercializationofTHztechnologyintheworld.Forexample,theABMillimetercompanyofFrance[13],theNTTcompanyofJapan[14],andtheMicrotechcompanyoftheUS[15]arealltheleadersofTHzfield.Therearesomanycommercialproductswhichisproducedbythisthreecorporations,Thefollowingaretheirproducts.TheproductsofABMillimeterCompanyFigure10:600-1000GHzSubmillimeterwavesources[15]ThesubteraherzsourceHG-wr1.2-FB-DHprovides0.001-0.01mWoutputpowerinthespectralrange660-1000GHz[15]TheproductsofABMillimeterCompanyFrequencyDynamicRange200GHz102dB300GHz90dB400GHz74dB500GHz60dB600GHz45dB700GHz75dB820GHz60dB920GHz45dB1000GHz30dBFigure11:MVNA-8-350VectorNetworkAnalysisSystem[16]TheproductsofNTTCompanyFigure12:DeviceofNTTcompanyinTHzimaginingandcommunication[16]TheproductsofNTTCompanyUTC-PD(uni-traveling-carrierphotodiode)photomixersareidealtogenerateCWTHzradiation,makingthebestuseofthetelecom-basedtechnology(1550nm).Two-typesofUTC-PDphotomixermodulesareavailable:awaveguide-coupledmodulesuitableforTHzcommunicationexperiments,andanantenna-integratedmodulewhichcanbeusedasradiationsourceforTHzspectroscopyandimaging[16].TheproductsofUSMicrotechInstrumentsFigure13:THzdetector[17]ThedetectorisdesignedforregistrationoftheTHzwave,asquarewavemodulationofwaveandasaw-toothofsignalvoltagefromthedetectorisproportionaltointensitytheintensityoftheradiation.Ablackfilterisfilledinthedetectortopreventthevisibleandinfraredwaves.Figure14.TheparameteroftheTHzdetectorConclusion1.THzcanbeobtainedforthewirelesscommunicationtransmissionrateof10GB/s.Comparedwiththecurrentultrabroadbandtechnology,itishundredsorthousandsoftimesfasterthanultrabroadbandcommunication.2.Comparedtheinfrared-ray,italsohasaveryhighabilitytopenetratethefogandastrongclouddirectivity.ThismakesTHzbandwidthofthecommunicationcanbecarriedoutextremelyhighsecuritycommunicationsinharshenvironment.3.AlthoughtherearemanyadvantagesofTHzcommunicationsystem,therearealsohavesomanyconstraints,suchas,Lackofemissionsourceandthedetectoratroomtemperature;THzsignalmodulationandprocessingareremainsthefocusofstudy.References[1]X.-C.Zhang,CenterforTHzResearchRensselaerPolytechnicInstitute,USA.“ResentProgressforTHzScience&Technology(PPT)”20/11/2014[2].K.Namjou,S.Chai,E.A.Whittaker,J.Faist,C.Gmachl,F,capasso,D.L.Sivco,andA.Y.Cho.Sensitiveabsorptionspectroscopywitharoom-temperaturedistributed-feedbackquatum-cascadelaser.OpticsLetters,23(3):219-221,February1998[3]J.F.Federici,B.Schulkin,F.Huang,D.Gary,R.Barat,F.Oliveira,andD.Zimdar.THzimagingandsensingforsecurityapplicationsexplosive,weaponsanddrugs.SemiconductorScienceandTechnology,2005[4].A.Y.Pawar,D,D,Sonawane,K.B.Eranade,andD.V.Derle.Terhertztechnologyanditsapplicatio