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Please use this identifier to cite or link to this item:
http://hdl.handle.net/2014/9433
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| Title: | Tantalum hot-electron bolometers for low-noise heterodyne receivers |
| Authors: | Skalare, A.
McGrath, W.
Bumble, B.
LeDuc, H. G. |
| Issue Date: | 26-Mar-2002 |
| Citation: | 13th International Symposium on Space TerahertzTechnologies |
| Abstract: | We describe superconducting diffusion-cooled hot-electron bolometers that were fabricated fromtantalum films grown on a thin niobium seed layer. The seed layer promotes single-phase growth of the Ta films, resulting in high-quality bolometers with transition temperatures up to 2.35 K and transition widths of less than 0.2 K. An S-parameter measurement set-up in a He-3 cryostat was used to measure device impedance versus frequency of a 400 nm long device at a temperature of 400 mK. It is shown that a 3 dB roll-off frequency of about 1 GHz can be achieved when the device resistance matches the impedance of the embedding network (no electrothermal feedback). This would lead to a prediction of 16 GHz for a 100 nm device, and indicates that a heterodyne mixer using a Ta HEB should be able to operate at several GHz even with a significant amount of electrothermal feedback. |
| URI: | http://hdl.handle.net/2014/9433 |
| Appears in Collections: | JPL TRS 1992+
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