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All-optoelectronic continuous-wave terahertz systems Loffler T; Siebert KJ; Quast H; Hasegawa N; Loata G; Wipf R; Hahn T; Thomson M; Leonhardt R; Roskos HGPhilos Trans A Math Phys Eng Sci 2004[Feb]; 362 (1815): 263-79; discussion 279-81We 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.ä |
