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We determine how a system composed of two nonidentical two-level atoms withdifferent resonance frequencies and different damping rates could work as anano-antenna for controlled mode switching and light routing. We calculate theangular distribution of the emitted field detected in a far-field zone of thesystem including the direct interatomic interactions and arbitrary lineardimensions of the system. The calculation is carried out in terms of thesymmetric and antisymmetric modes of the two atom system. We find that as longas the atoms are identical, the emission cannot be switched between thesymmetric and antisymmetric modes. The switching may occur when the atoms arenon-identical and the emission can then be routed to different modes bychanging the relative ratio of the atomic frequencies, or damping rates or by aproper tuning of the laser frequency to the atomic resonance frequencies. It isshown that in the case of atoms of different resonance frequencies but equaldamping rates, the light routing is independent of the frequency of the drivinglaser field. It depends only on the sign of the detuning between the atomicresonance frequencies. In the case of atoms of different damping rates, theemission can be switched between different modes by changing the laserfrequency from the blue to red detuned from the atomic resonance. The effect ofthe interatomic interactions is also considered and it is found that in thecase of unequal resonance frequencies of the atoms, the interactions slightlymodify the visibility of the intensity pattern. The case of unequal dampingrates of the atoms is affected rather more drastically, the light routingbecoming asymmetric under the dipole-dipole interaction with the enhancedintensities of the modes turned towards the atom of smaller damping rate.

Two-atom system as a nano-antenna for mode switching and light routing