Terahertz Bloch oscillator with a modulated bias

Details Terahertz Bloch oscillator with a modulated bias Terahertz Bloch oscillator with a modulated bias

2008-12-21

arxiv.org/abs/0812.4046v1

Phys. Rev. Lett. 102, 140405 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages

Scientific paper

10.1103/PhysRevLett.102.140405

Electrons 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.

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