All-optoelectronic continuous-wave terahertz systems.
We discuss the optoelectronic generation and detection of continuous-wave terahertz (THz) radiation by the mixing of visible/near-infrared laser radiation in photoconductive antennas. We review attempts to reach higher THz output-power levels by reverting from mobility-lifetime-limited photomixers to transit-time-limited p-i-n photodiodes. We then describe our implementation of a THz spectroscopy and imaging-measurement system and demonstrate its imaging performance with several examples. Possible application areas of THz imaging in the biomedical field and in surface characterization for industrial purposes are explored.
Physikalisches Institut, Johann Wolfgang Goethe-Universität, Robert-Mayer-strasse 2-4, 60054 Frankfurt-am-Main, Germany. t.loeffler@physik.uni-frankfurt.de
Torsten
T
Löffler
Karsten J
KJ
Siebert
Holger
H
Quast
Noburu
N
Hasegawa
Gabriel
G
Loata
Robert
R
Wipf
Tobias
T
Hahn
Mark
M
Thomson
Rainer
R
Leonhardt
Hartmut G
HG
Roskos