Abstract
A long standing but not quite verified tenet is that excited classical oscillators may build up a mechanism for stimulated emission from miniaturized condensed media in the submillimeter and far-infrared wavelength range [1].
Thus far, these processes can provide only broadband gain in bulky systems such as free-electron lasers [2], whereas the recent paradigm of Josephson Junction laser is limited as a source of microwave radiation [3]. In this talk, we examine acoustically excited semiconductor superlattice (SL) (see Fig. 1) as a medium of classical broadband lasing. By resorting to a semi-classical kinetic approach, we analyze the effect of a small acoustic strain on small-signal absorption and broadband electromagnetic gain. Our analysis reveals a giant, electrically stable and tunable GHz-THz gain with physical origin the nonlinear Landau effect [4,5].
[1] Gaponov, A. V., M. I. Petelin, and V. K. Yulpatov. "The induced radiation of excited classical oscillators and its use in high-frequency electronics." Radiophysics and Quantum Electronics 10.9-10 (1967): 794-813.
[2] Hopf, F. A., et al. "Classical theory of a free-electron laser." Physical Review Letters 37.18 (1976): 1215.
[3] Simon, Steven H., and Nigel R. Cooper. "Theory of the Josephson junction laser." Physical Review Letters 121.2 (2018): 027004.
[4] Gal'perin, Yu M., Vadim Lvovich Gurevich, and Veniamin Ivanovich Kozub. "Nonlinear effects in the propagation of high-frequency sound in normal conductors." Soviet Physics Uspekhi 22.5 (1979): 352.
[5] Kadomtsev, B. B. "Cooperative effects in plasmas." Reviews of Plasma Physics (2001): 1-226.