Wyniki wyszukiwania - Biblioteka Nauki

Ten serwis zostanie wyłączony 2025-02-11.

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

2 Acta Physica Polonica A

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

THz Double-Grating Gate Transistor Detectors in High Magnetic Fields

100%

But D. , Dyakonova N. , Coquillat D. , Teppe F. , Knap W. , Watanabe T. , Tanimoto Y. , Boubanga Tombet S. , Otsuji T.

nr 6

1080-1082

Double-grating-gate field-effect transistors have a great potential as terahertz detectors. This is because the double grating gate serves not only for carrier density tuning but also as an efficient THz radiation coupler. In this paper, we present characterization of these transistors using high magnetic fields. Low and high magnetic field data are used to determine the electron mobility and electron concentration, respectively, in different parts of the transistor channel.

80%

Dyakonova N. , El Fatimy A. , Meziani Y. , Coquillat D. , Knap W. , Teppe F. , Buzatu P. , Diforte-Poisson M. , Dua C. , Piotrowicz S. , Morvan E. , Delage S.

Acta Physica Polonica A

2011

tom 120

nr 5

924-926

The current flowing in two-dimensional channel of field effect transistors can generate different types of charge density perturbations. They can have a form of uncorrelated hot plasmons or plasma waves. The mechanism of plasma wave generation depends on the parameter ωt and on boundary conditions of the channel. At ωt ≪ 1 only hot plasmons can be generated. The THz emission due to radiative decay of hot plasmons has a broad spectrum and can be only poorly controlled by the transistor gate. The tunability of THz emission can be obtained in the case of the Dyakonov-Shur plasma wave instability. In this work we present experimental studies of THz emission in InGaP/InGaAs/GaAs and GaN/AlGaN based field effect transistors. We report on two types of emission onset: (i) a smooth one typical for hot plasmons generation and (ii) threshold-like one characteristic for plasma waves instabilities. The tunability and spectra of emission change depending on the transistor configuration. We discuss the results suggesting several possible mechanisms of plasma wave excitation.

Terahertz Detection of Quantum Cascade Laser Emission by Plasma Waves in Field Effect Transistors

80%

Teppe F. , Consejo C. , Torres J. , Chenaud B. , Solignac P. , Fathololoumi S. , Wasilewski Z. , Zholudev M. , Dyakonova N. , Coquillat D. , El Fatimy A. , Buzatu P. , Chaubet C. , Knap W.

Acta Physica Polonica A

2011

tom 120

nr 5

930-932

We report on the resonant detection of a 3.1 THz radiation produced by a quantum cascade laser using a 250 nm gate length GaAs/AlGaAs field effect transistor at liquid nitrogen temperature. We show that the physical mechanism of the detection is related to the plasma waves excited in the transistor channel. The detection is enhanced by increasing the drain current and driving the transistor into saturation regime. These results clearly show that plasma wave nanometer-size transistors can be used as detectors in all-solid-state terahertz systems where quantum cascade lasers act as sources.