| Autor: |
Nader Esfahani, Nima, Fredricksen, Christopher J., Medhi, Gautam, Peale, R. E., Cleary, Justin W., Buchwald, Walter R., Saxena, Himanshu, Edwards, Oliver J. |
| Zdroj: |
Proceedings of SPIE; May 2011, Vol. 8023 Issue: 1 p80230R-80230R-10, 7942781p |
| Abstrakt: |
Tunable resonant absorption by plasmons in the two-dimensional electron gas (2DEG) of grating-gated HEMTs is known for a variety of semiconductor systems, giving promise of chip-scale frequency- agile THz imaging spectrometers. In this work, we present our approach to measurement of electrical response to millimeter waves from backward-wave oscillators (BWO) in the range 40-110 GHz for InP-based HEMTs. Frequency-modulation of the BWO with lock-in amplification of the source-drain current gives an output proportional to the change in absorption with frequency without contribution from non-resonant response. This is a first step in optimizing such devices for man-portable or space-based spectral-sensing applications. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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