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28 March 2024
 
  » arxiv » 0812.4046

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Terahertz Bloch oscillator with a modulated bias
Timo Hyart ; Natalia V. Alexeeva ; Jussi Mattas ; Kirill N. Alekseev ;
Date 21 Dec 2008
AbstractElectrons performing Bloch oscillations in an energy band of a dc-biased superlattice in the presence of weak dissipation can potentially generate THz fields at room temperature. The realization of such Bloch oscillator is a long-standing problem due to the instability of a homogeneous electric field in conditions of negative differential conductivity. We establish the theoretical feasibility of stable THz gain in a long superlattice device in which the bias is quasistatically modulated by microwave fields. The modulation waveforms must have at least two harmonics in their spectra.
Source arXiv, 0812.4046
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