简介：Terahertzwaves,sittinginthegapbetweenthemiddleinfraredandmillimeterwaveregions,areknownasthelastvacantareaoftheelectromagneticspectrumthathasnotquitebeenunderstoodandbroughtintoapplications.TheTerahertzregionhasbeenthefocusofresearchworldwidesinceearly1990s.Duetotheiruniquecharacteristics,

简介：Theterahertz(THz)regionoftheelectromagneticspectrum,spanningtherangebetween0.1THzand10THz,hasexperiencedarenaissanceduetotechnologicaldevelopmentsinsourcesanddetectors.Theterahertztimedomainspectroscopy(THz-TDS)systemisbyfaroneofthemostimportantmethodstogenerateanddetecttheTHzwave.Inphysics,THz-TDSisaspectroscopictechniqueinwhichthepropertiesofamaterialareprobedwithshort

简介：Vanadiumdioxide(VO2)isaphasetransitionmaterialwhichundergoesareversiblemetal-insulatortransition(MIT)whentriggeredbythermal,photo,electrical,andevenstress.ThehugeconductionchangeofVO2rendersitapromisingmaterialforterahertz(THz)manipulation.Inthispaper,someinterestingworksconcerningthegrowthandcharacteristicsoftheVO2filmareselectivelyreviewed.AswitchingofTHzradiationbyphoto-drivenVO2filmisdemonstrated.ExperimentsindicateanultrafastopticalswitchingtoTHztransmissionwithin8picoseconds,andaswitchingratioreachestoover80%duringawidefrequencyrangefrom0.3THzto2.5THz.

简介：Lyingbetweenradiofrequencyandinfraredradiation,terahertz(THz)waveencounterslotsofdifficultiestoproduce,detect,transmit,andmodulate.GreateffortshavebeenmadetoconstructTHzdevices,includingsources,detectors,switches,modulators,lenses,andfilters.However,onlymoderateprogresseshavebeenmadeinTHzgenerationanddetection.Furthermore,thedevicesandtechniquestocontrolandmanipulateTHzwavesarestillinitsinfancy.Therefore,itisstillachallengetodateto