Fano resonance and resonant localization of excitonic wave in one-dimensional quantum dot array with a ring

• The Fano interference of excitonic wave through a quantum dot array has been studied.
• We also study the Anderson-like localization of the excitonic wave in the ring side.
• Under some particular conditions, the excitation is resonantly localized in the ring side.
• The result can be utilized for the design of nano-optical devices.

The Fano interference of excitonic wave transmitting through a quantum dot chain array with a ring and the Anderson-like localization of the excitonic wave in the ring side are studied. In the quantum dot chain array with a ring, propagating excitonic waves via resonant dipole–dipole interaction interfere with the scattered excitonic wave from the ring and results in the Fano resonance. The excitation energy through the ring is transmitted, reflected, or localized depending on the dipole–dipole couplings to the Fano defect in the ring and transition energy detuning of the defect. Consequently, under some particular conditions, the excitation is resonantly localized in the ring side in the sense of Anderson-like localization by the destructive interference of the totally reflected wave from the ring with the incoming excitonic wave.