Abstract-Asymmetric strip line electrodes for photoconductive terahertz emission

Singh, A.; Winnerl, S.; König-Otto, J. C.; Stephan, D. R.; Helm, M.; Schneider, H.

http://www.hzdr.de/db/!Publications?pNid=head&pSelMenu=0&pSelTitle=26794

Here we studied various combinations (two symmetric and two asymmetric designs) of stripline widths for stripline photoconductive emitters fabricated on semi-insulating GaAs. We found out that the THz emission efficiency depends strongly on the anode width. The wider the anode, the higher is the THz amplitude. Cathode width does not play a significant role in THz emission performance. 

Abstract-Plasmonic efficiency enhancement at the anode of strip line photoconductive terahertz emitters

Abhishek Singh, Stephan Winnerl, Jacob C. König-Otto, Daniel R. Stephan, Manfred Helm, and Harald Schneider

https://www.blogger.com/blogger.g?blogID=124073320791841682#editor/target=post;postID=964173647966952561

We investigate strip line photoconductive terahertz (THz) emitters in a regime where both the direct emission of accelerated carriers in the semiconductor and the antenna-mediated emission from the strip line play a significant role. In particular, asymmetric strip line structures are studied. The widths of the two electrodes have been varied from 2 µm to 50 µm. The THz emission efficiency is observed to increase linearly with the width of the anode, which acts here as a plasmonic antenna giving rise to enhanced THz emission. In contrast, the cathode width does not play any significant role on THz emission efficiency.

© 2016 Optical Society of America

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