Computer Science
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3357..132b&link_type=abstract
Proc. SPIE Vol. 3357, p. 132-142, Advanced Technology MMW, Radio, and Terahertz Telescopes, Thomas G. Phillips; Ed.
Computer Science
Scientific paper
Low-temperature-grown (LTG) GaAs offers the combination of sub-picosecond photocarrier lifetime and high breakdown electric field (greater than 5 X 105 V/cm), and is grown in epitaxial films having excellent quality for microelectronic fabrication. A THz photoconductive mixer (photomixer) is formed on these films by patterning low- capacitance planar electrodes coupled to a coplanar antenna. The photomixer is conveniently pumped by two frequency-offset diode-laser beams focused on the exposed GaAs area between the electrodes. This paper summarizes the operational principles of the photomixer in contrast to a competing technique based on coherent three-wave photonic mixing. It then reviews different configurations of the photomixer as a laboratory tunable source for chemistry and metrology, and addresses some of the challenges in applying the photomixer as a local oscillator in portable spectroscopic and radiometric receivers.
Brown Elliott R.
McIntosh Alexander K.
Verghese Simon
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