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Single‐pixel terahertz imaging:a review

Opto-Electronic Advances 2020年第9期3卷 15-29页

作者： luca Zanotto Riccardo Piccoli Junliang Dong Roberto Morandotti luca razzari Institut National de la Recherche Scientifique(INRS) CentreÉnergieMatériaux et Télécommunications(EMT)VarennesQC J3X 1S2Canada Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

This paper is devoted to reviewing the results achieved so far in the application of the single-pixel imaging technique to terahertz(THz)*** use of THz radiation for imaging purposes has been largely explored in the last twenty years,due to the unique capabilities of this kind of radiation in interrogating material ***,THz imaging systems are still limited by the long acquisition time required to reconstruct the object image and significant efforts have been recently directed to overcome this *** of the most promising approaches in this sense is the so-called“single-pixel”imaging,which in general enables image reconstruction by patterning the beam probing the object and measuring the total transmission(or reflection)with a single-pixel detector(i.e.,with no spatial resolution).The main advantages of such technique are that i)no bulky moving parts are required to raster-scan the object and ii)compressed sensing(CS)algorithms,which allow an appropriate reconstruction of the image with an incomplete set of measurements,can be successfully ***,this can result in a reduction of the acquisition *** this review,we cover the experimental solutions proposed to implement such imaging technique at THz frequencies,as well as some practical uses for typical THz applications.

关键词： terahertz imaging single-pixel imaging compressed sensing

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A universal route to efficient non-linear response via Thomson scattering in linear solids

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National Science Review 2023年第7期10卷 203-212页

作者： Yongzheng Wen Flavio Giorgianni Igor Ilyakov Baogang Quan Sergey Kovalev Chen Wang Carlo Vicario Jan-Christoph Deinert Xiaoyu Xiong Joe Bailey Min Chen Alexey Ponomaryov Nilesh Awari Andrea Rovere Jingbo Sun Roberto Morandotti luca razzari Gabriel Aeppli Junjie Li Ji Zhou State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Paul Scherrer Institut Helmholtz-Zentrum Dresden-Rossendorf Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Institut de Physique école Polytechnique Fédérale de Lausanne (EPFL) Institut National de la Recherche Scientifique (INRS) Centreénergie Matériaux et Télécommunications (EMT) Department of Physics and Quantum Center ETH Zürich

Non-linear materials are cornerstones of modern optics and *** dependence on the intrinsic properties of particular materials,however,inhibits the at-will extension of demanding non-linear effects,especially those second-order ones,to widely adopted centrosymmetric materials(for example,silicon) and te chnologically important burgeoning spectral domains(for example,terahertz frequencies).Here we introduce a universal route to efficient non-linear responses enabled by exciting non-linear Thomson scattering,a fundamental process in electrodynamics that was known to occur only in relativistic electrons in metamaterial composed of linear *** a mechanism modulates the trajectory of charges,either intrinsically or extrinsically provided in solids,at twice the driving frequency,allowing second-harmonic generation at terahertz frequencies on crystalline silicon with extremely large non-linear susceptibility in our proof-of-concept *** offering a substantially material-and frequency-independent platform,our approach opens new possibilities in the fields of on-demand non-linear optics,terahertz sources,strong field light-solid interactions and integrated photonic circuits.

关键词： non-linear optical materials terahertz harmonic generation Thomson scattering magneto-electric coupling metamaterial

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