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


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

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

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. This is a consequence of the emission being caused by photoexcited electrons while the effect of photoexcited holes is negligible.

Keywords: Terahertz emitters; photoconductivity; plasmonic antenna

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Permalink: https://www.hzdr.de/publications/Publ-23441
Publ.-Id: 23441