Plasmonic efficiency enhancement at the anode of strip line photoconductive terahertz emitters.
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.
Abhishek
A
Singh
Stephan
S
Winnerl
Jacob C
JC
König-Otto
Daniel R
DR
Stephan
Manfred
M
Helm
Harald
H
Schneider