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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