典型文献
Scalable high-repetition-rate sub-half-cycle terahertz pulses from spatially indirect interband transitions
文献摘要：
Intense phase-locked terahertz(THz)pulses are the bedrock of THz lightwave electronics,where the carrier field creates a transient bias to control electrons on sub-cycle time scales.Key applications such as THz scanning tunnelling microscopy or electronic devices operating at optical clock rates call for ultimately short,almost unipolar waveforms,at megahertz(MHz)repetition rates.Here,we present a flexible and scalable scheme for the generation of strong phase-locked THz pulses based on shift currents in type-ll-aligned epitaxial semiconductor heterostructures.The measured THz waveforms exhibit only 0.45 optical cycles at their centre frequency within the full width at half maximum of the intensity envelope,peak fields above 1.1 kVcm-1 and spectral components up to the mid-infrared,at a repetition rate of 4 MHz.The only positive half-cycle of this waveform exceeds all negative half-cycles by almost four times,which is unexpected from shift currents alone.Our detailed analysis reveals that local charging dynamics induces the pronounced positive THz-emission peak as electrons and holes approach charge neutrality after separation by the optical pump pulse,also enabling ultrabroadband operation.Our unipolar emitters mark a milestone for flexibly scalable,next-generation high-repetition-rate sources of intense and strongly asymmetric electric field transients.
文献关键词：
中图分类号：
作者姓名：
Christian Meineke;Michael Prager;Johannes Hayes;Qiannan Wen;Lukas Zheyi Kastner;Dieter Schuh;Kilian Fritsch;Oleg Pronin;Markus Stein;Felix Sch?fer;Sangam Chatterjee;Mackillo Kira;Rupert Huber;Dominique Bougeard
作者机构：
Department of Physics,University of Regensburg,93040 Regensburg,Germany;Department of Electrical Engineering and Computer Science,University of Michigan,Ann Arbor,Ml 48109,USA;Faculty of Electrical Engineering,Helmut Schmidt University,22043 Hamburg,Germany;Institute of Experimental Physics I,Justus Liebig University Giessen,35392 Giessen,Germany
文献出处：
引用格式：
[1]Christian Meineke;Michael Prager;Johannes Hayes;Qiannan Wen;Lukas Zheyi Kastner;Dieter Schuh;Kilian Fritsch;Oleg Pronin;Markus Stein;Felix Sch?fer;Sangam Chatterjee;Mackillo Kira;Rupert Huber;Dominique Bougeard-.Scalable high-repetition-rate sub-half-cycle terahertz pulses from spatially indirect interband transitions)[J].光：科学与应用（英文版）,2022(06):1304-1311
A类：
kVcm
B类：
Scalable,high,repetition,sub,half,terahertz,pulses,from,spatially,indirect,interband,transitions,Intense,phase,locked,THz,bedrock,lightwave,electronics,where,carrier,creates,bias,control,electrons,scales,Key,applications,such,scanning,tunnelling,microscopy,devices,operating,optical,clock,rates,call,ultimately,short,almost,unipolar,waveforms,megahertz,MHz,Here,we,present,flexible,scalable,scheme,generation,shift,currents,type,aligned,epitaxial,semiconductor,heterostructures,measured,exhibit,only,cycles,their,centre,frequency,within,full,width,maximum,intensity,envelope,peak,fields,above,spectral,components,up,mid,infrared,positive,this,exceeds,negative,by,four,times,which,unexpected,alone,Our,detailed,analysis,reveals,that,local,charging,dynamics,induces,pronounced,emission,holes,approach,charge,neutrality,after,separation,pump,also,enabling,ultrabroadband,operation,emitters,mark,milestone,flexibly,next,sources,intense,strongly,asymmetric,electric,transients
AB值：
0.633713
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