Ultrafast imaging of terahertz electric waveforms using quantum dots  

作　　者：Moritz B.Heindl Nicholas Kirkwood Tobias Lauster Julia A.Lang Markus Retsch Paul Mulvaney Georg Herink 

机构地区：[1]Experimental Physics VIII-Ultrafast Dynamics,University of Bayreuth,Bayreuth,Germany [2]ARC Centre of Excellence in Exciton Science,School of Chemistry,University of Melbourne,Melbourne,Australia [3]Physical Chemistry I,University of Bayreuth,Bayreuth,Germany

出　　处：《Light(Science & Applications)》2022年第1期63-68,共6页光（科学与应用)（英文版）

基　　金：the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)via project 403711541;T.L.acknowledges funding from the European Research Council(ERC)under the European Union’s Horizon 2020 research program(grant agreement no.714968);N.K.and P.M.thank the ARC for support through grant CE170100026.

摘　　要：Microscopic electric fields govern the majority of elementary excitations in condensed matter and drive electronics at frequencies approaching the Terahertz(THz)regime.However,only few imaging schemes are able to resolve sub-wavelength fields in the THz range,such as scanning-probe techniques,electro-optic sampling,and ultrafast electron microscopy.Still,intrinsic constraints on sample geometry,acquisition speed and field strength limit their applicability.Here,we harness the quantum-confined Stark-effect to encode ultrafast electric near-fields into colloidal quantum dot luminescence.Our approach,termed Quantum-probe Field Microscopy(QFIM),combines far-field imaging of visible photons with phase-resolved sampling of electric waveforms.By capturing ultrafast movies,we spatio-temporally resolve a Terahertz resonance inside a bowtie antenna and unveil the propagation of a Terahertz waveguide excitation deeply in the sub-wavelength regime.The demonstrated QFIM approach is compatible with strong-field excitation and sub-micrometer resolution—introducing a direct route towards ultrafast field imaging of complex nanodevices inoperando.

关 键 词：ANTENNA WAVEGUIDE QUANTUM 

分 类 号：O413[理学—理论物理]