ISSTT Proceedings

ISSTT Proceedings

You searched for:search icon

No Keywords
Showing 0 of items from your search. Start over 

HgCdTe Photoconductive Mixers for 2-8 THz

Authors:
A.L. Betz, R.T. Boreiko, S. Sivananthan, R. Ashokan
Abstract:
Heterodyne spectroscopy has been taken to wavelengths as short as 63 µm with Schottky-diode mixers [Boreiko and Betz 1996]. Schottkys, however, are relatively insensitive compared to superconducting mixers such as the hot-electron microbolometer (HEB), which has an effective quantum efficiency of 3% at 120 µm (2.5 THz). Although HEB sensitivities are bound to improve, there will always be losses associated with antenna coupling of radiation into sub-micron size devices. Another approach to FIR mixer design is to use a photoconductive device which can be made much larger than a wavelength, and thus act as its own antenna. For example, HgCdTe photodiodes have been used as mixers in the [lamda]=10 µm band for over 25 years [Betz 1981], with sensitivities now only a factor of 2 from the quantum-noise-limit. HgCdTe can also be applied at FIR wavelengths, but surprisingly little work has been done to date. The exception is the pioneering work of Spears (1988) and Kostiuk and Spears (1987), who developed HgCdTe photomixers for the 20-120 µm region.
Categories:
Detectors, Mixers
Year:
2001
Session:
4
Full-text:
Download a PDF of this paper.
Page Number(s):
92-101