| 1 | Cavity-based photoconductive sources for real-time terahertz imaging显示文摘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. | 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 | 2020 | Photonics Research2020，8，6： | 1 |
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