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Terahertz Resonant Detection by Plasma Waves in Nanometric Transistors

100%

Teppe F., El Fatimy A., Boubanga S., Knap W., Seliuta D., Valusis G., Chenaud B.

Acta Physica Polonica A

2008

vol. 113

issue 3

815-820

The plasma waves in gated two-dimensional electron gas have a linear dispersion law, similar to the sound waves. The transistor channel is acting as a resonator cavity for the plasma waves, which can reach frequencies in the THz range for a sufficiently short gate length field effect transistors. A variety of possible applications of field effect transistor operating as a THz device were suggested. In particular, it was shown that the nonlinear properties of plasma oscillations can be utilized for THz tunable detectors. During the last few years THz detection related to plasma wave instabilities in nanometer size field effect transistors was demonstrated experimentally. In this work we review our recent experimental results on the resonant plasma wave detection at cryogenic and room temperatures.

Terahertz Detection by the Entire Channel of High Electron Mobility Transistors

68%

Sakowicz M., Łusakowski J., Karpierz K., Knap W., Grynberg M., Köhler K., Valusis G., Gołaszewska K., Kamińska E., Piotrowska A., Caban P., Strupiński W.

Acta Physica Polonica A

2008

vol. 114

issue 5

1343-1348

GaAs/AlGaAs and GaN/AlGaN high electron mobility transistors were used as detectors of THz electromagnetic radiation at liquid helium temperatures. Application of high magnetic fields led to the Shubnikov-de Haas oscillations of the detection signal. Measurements carried out with a simultaneous modulation of the intensity of the incident THz beam and the transistor gate voltage showed that the detection signal is determined by the electron plasma both in the gated and ungated parts of the transistor channel. This result is of importance for understanding the physical mechanism of the detection in high electron mobility transistors and for development of a proper theoretical description of this process.

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2 Acta Physica Polonica A

2 2008

2 Knap W.

2 Valusis G.

1 Boubanga S.

1 Caban P.

1 Chenaud B.

1 El Fatimy A.

1 Gołaszewska K.

1 Grynberg M.

1 Kamińska E.

1 Karpierz K.

1 Köhler K.

1 Piotrowska A.

1 Sakowicz M.

1 Seliuta D.

1 Strupiński W.

1 Teppe F.

1 Łusakowski J.

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Terahertz Resonant Detection by Plasma Waves in Nanometric Transistors

Terahertz Detection by the Entire Channel of High Electron Mobility Transistors