Terahertz electroluminescence of Fibonacci superlattices

The electroluminescence of AlGaAs Fibonacci superlattices in the terahertz range is studied theoretically. Linear behavior of the optical amplification coefficient $G$ and multicolored emission with peaks of $G$ higher than 20 cm$^{-1}$ without accompanying absorption peaks are observed in electric fields of $F$ = 11–13 kVcm$^{-1}$ at the frequencies $f$ = 2–4 THz. The parameters of the peaks can be conveniently controlled by varying the electric field and the superlattice layer thicknesses. Such emitters based on quasi-periodic super-lattices offer promise for terahertz technology.