Active medium engineering in systems of quantum wires and dots: Novel artificial structures for submillimeter wave oscillators
Max-Planck Institut für Physik komplexer Systeme
Nöthnitzer Str. 38, D-01187 Dresden, Germany
Accepted: 17 February 1999
We design an artificial semiconductor structure which may serve as an active medium for amplifiers and oscillators of submillimeter electromagnetic waves. The basic element of the medium is an array of quantum wires or dots with a complex elementary cell. The proposed structure amplifies (generates) electromagnetic waves at a frequency , being pumped by an electromagnetic radiation with the frequency , due to a parametric resonance occurring in the system. The operating frequency depends on the lateral dimensions of wires or dots, and can be chosen in a wide range from THz up to a few terahertzs. The calculated threshold pumping power of the quantum-wire oscillator is below 1 mW/cm2 at the liquid helium temperature.
PACS: 07.57.Hm – Infrared, submillimeter wave, microwave, and radiowave sources / 85.30.Vw – Low-dimensional quantum devices (quantum dots, quantum wires, etc.)
© EDP Sciences, 1999