W. Knap, M.I. Dyakonov,
https://www.sciencedirect.com/science/article/pii/B9780857092359500057
This chapter gives an overview of the main physical ideas and experimental results concerning the application of field effect transistors (FETs) for the generation and detection of terahertz (THz) radiation. Resonant frequencies of the two-dimensional plasma oscillations in FETs increase with the reduction of the channel dimensions and for submicron gate length reach the THz range. When the mobility is high enough, the dynamics of a short channel FET at THz frequencies is dominated by plasma waves. This may result, on the one hand, in a direct current (dc) induced spontaneous generation of plasma waves and THZ emission and, on the other hand, in a resonant photoresponse to incoming radiation. In other cases, when plasma oscillations are overdamped, the FET can operate as an efficient broadband THz detector.
W. Knap, M.I. Dyakonov,
https://www.sciencedirect.com/science/article/pii/B9780857092359500057
This chapter gives an overview of the main physical ideas and experimental results concerning the application of field effect transistors (FETs) for the generation and detection of terahertz (THz) radiation. Resonant frequencies of the two-dimensional plasma oscillations in FETs increase with the reduction of the channel dimensions and for submicron gate length reach the THz range. When the mobility is high enough, the dynamics of a short channel FET at THz frequencies is dominated by plasma waves. This may result, on the one hand, in a direct current (dc) induced spontaneous generation of plasma waves and THZ emission and, on the other hand, in a resonant photoresponse to incoming radiation. In other cases, when plasma oscillations are overdamped, the FET can operate as an efficient broadband THz detector.
Zeinab Kargar, Dino Ruic, Tobias Linn, Christoph Jungemann
http://ieeexplore.ieee.org/document/8085324/
Plasma oscillation in a submicron gate length field effect transistor is a promising candidate for terahertz emissions. The transport model plays a significant role for the simulation of the instability leading to the self excitation of plasma oscillations. For this purpose, the growth rate and frequency of the plasma instability are compared using a simple transport model based on the Euler equation and the complete Boltzmann transport equation. The comparison shows that the simple transport model fails to capture important aspects included in the Boltzmann equation concerning the generation of plasma waves at high electric fields and low temperatures.
Authors: Srivats Rajasekaran, Eliza Casandruc, Yannis Laplace, Daniele Nicoletti, Genda D. Gu,Stephen R. Clark, Dieter Jaksch, Andrea Cavalleri
http://www.mathpubs.com/detail/1511.08378v1/Parametric-Amplification-of-a-Terahertz-Quantum-Plasma-Wave
Many applications in photonics require all-optical manipulation of plasma waves, which can concentrate electromagnetic energy on sub-wavelength length scales. This is difficult in metallic plasmas because of their small optical nonlinearities. Some layered superconductors support weakly damped plasma waves, involving oscillatory tunneling of the superfluid between capacitively coupled planes. Such Josephson plasma waves (JPWs) are also highly nonlinear, and exhibit striking phenomena like cooperative emission of coherent terahertz radiation, superconductor-metal oscillations and soliton formation. We show here that terahertz JPWs in cuprate superconductors can be parametrically amplified through the cubic tunneling nonlinearity. Parametric amplification is sensitive to the relative phase between pump and seed waves and may be optimized to achieve squeezing of the order parameter phase fluctuations or single terahertz-photon devices.
