Abstract

Exposed to a strong electromagnetic field, a two-level system with broken inversion symmetry radiates at the Rabi frequency ${\mathrm{\Omega }}_R$. This can be used to generate terahertz waves [Phys. Rev. Lett. 102, 023601 (2009) [CrossRef]  ]. We show that a system composed of two tunneling-coupled asymmetric two-level systems radiates at frequency $\sqrt{{({\xi }_1-{\xi }_2)}^2+{\mathrm{\Omega }}_R^2}$, where energies $\hslash {\xi }_1$ and $\hslash {\xi }_2$ characterize the tunneling interaction. This opens the possibility of tuning the terahertz spectrum in a considerable range. We also show that for particular amplitudes of the driving field, the emission at frequency $\sqrt{{({\xi }_1-{\xi }_2)}^2+{\mathrm{\Omega }}_R^2}$ is suppressed.

© 2016 Optical Society of America

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