Cavity-based photoconductive sources for real-time terahertz imaging  

作　　者：J.HAWECKER V.PISTORE A.MINASYAN K.MAUSSANG J.PALOMO I.SAGNES J.-M.MANCEAU R.COLOMBELLI J.TIGNON J.MANGENEY AND S.S.DHILLON 

机构地区：[1]Laboratoire de Physique de I'Ecole normale superieure,ENS,Universite PSL,CNRS,Sorbonne Universite,Universite de Paris,F-75005 Paris,France [2]i2S,28-30 rue Jean Perrin 33608 Pessac,France [3]Centre de Nanosciences et de Nanotechnologies(C2N),CNRS UMR 9001,Universite Paris-Saclay,91120 Palaiseau,France [4]Institut d'Electronique et des Systemes,CNRS(UMR 5214),Univ Montpellier,860 rue de Saint-Priest,34095 Montpellier Cedex 5,France

出　　处：《Photonics Research》2020年第6期858-863,共6页光子学研究（英文版）

基　　金：H2020 Future and Emerging Technologies(MIRBOSE 737017);French RENATECH network.

摘　　要：Optically driven photoconductive switches are one of the predominant sources currently used in terahertz im-aging systems.However,owing to their low average powers,only raster-based images can be taken,resulting in slow acquisition.In this work,we show that by placing a photoconductive switch within a cavity,we are able to generate absolute average THz powers of 181μW with the frequency of the THz emission centered at 1.5 THz-specifications ideally adapted to applications such as non-destructive imaging.The cavity is based on a metal-insulator-metal structure that permits an en hancement of the average power by almost 1 order of magnitude compared to a standard structure,while conserving a broadband spectral response.We demonstrate proof-of-principle real-time imaging using this source,with the broadband spectrum permitting to eliminate strong diffraction artifacts.

关 键 词：PHOTOCONDUCTIVE SOURCES CAVITY 

分 类 号：O441[理学—电磁学]