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20 August 2020 Cavity based THz photoconductive switches: real time THz imaging
Jacques Hawecker, Valentino Pistore, Amalya Minasyan, Kenneth Maussang, José Palomo, Isabelle Sagnes, Jean-Michel Manceau, Raffaele Colombelli, Juliette Mangeney, Jerome Tignon, Sukhdeep Dhillon
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Proceedings Volume 11499, Terahertz Emitters, Receivers, and Applications XI; 1149910 (2020) https://doi.org/10.1117/12.2568618
Event: SPIE Optical Engineering + Applications, 2020, Online Only
Abstract
Optically-driven photoconductive switches are one of the predominant sources currently used in terahertz imaging systems. However, owing to their low average powers, only raster-based images can be taken, resulting in slow acquisition times. In this work, we show that placing a photoconductive switch within a cavity, we are able to generate absolute THz powers of 181 µW. The cavity is based on a metal-insulator-metal structure that permits an enhancement of the average power by almost one order of magnitude whilst conserving a broadband response. We demonstrate real-time imaging using this source, with the broadband spectrum permitting to eliminate diffraction artefacts.
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Jacques Hawecker, Valentino Pistore, Amalya Minasyan, Kenneth Maussang, José Palomo, Isabelle Sagnes, Jean-Michel Manceau, Raffaele Colombelli, Juliette Mangeney, Jerome Tignon, and Sukhdeep Dhillon "Cavity based THz photoconductive switches: real time THz imaging", Proc. SPIE 11499, Terahertz Emitters, Receivers, and Applications XI, 1149910 (20 August 2020); https://doi.org/10.1117/12.2568618
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KEYWORDS
Terahertz radiation
Real time imaging
Switches
Diffraction
Modulation
Nondestructive evaluation
Opacity
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