Terahertz photoconductive waveguide emitter with excitation by a tilted optical pulse front

  • We explore the tilted-pulse-front excitation technique to control the superradiant emission of terahertz (THz) pulses from large-area photonconductive semiconductor switches. Two cases are studied. First, a photoconductive antenna emitting into free space, where the propagation direction of the optically generated THz beam is controlled by the choice of the tilt angle of the pump pulse front. Second, a THz waveguide structure with an integrated photoconductive window for the generation of THz radiation, where the injection of the THz radiation into a waveguide mode is optimized by the pulse front tilt. By providing long interaction lengths, such a waveguide-based optical-pump/THz-probe set-up may provide a new platform for the study of diverse short-lived optically induced excitations.

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Author:Islam Qamar-Ul, Fanqi MengORCiD, Mark David Thomson, Hartmut RoskosORCiDGND
Parent Title (English):Optics express
Place of publication:Washington, DC
Document Type:Article
Date of Publication (online):2020/10/23
Date of first Publication:2020/10/23
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2021/11/03
Page Number:9
First Page:33673
Last Page:33681
Q.-U.I. greatfully acknowledges funding by a scholarship of the HessenFonds of the Hessian Ministry for Science and Art. F.M. acknowledges funding by DFG (RO 770/40 and RO 770/41).
© 2020 Optica Publishing Group. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht