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Optics Communications

Voltage-controlled storage and retrieval of an infrared-light pulse in a quantum-dot molecule

Jiahua Li, Rong Yu, Liu-Gang Si, Xiaoxue Yang

Published Mar 19, 2009• 22 citations
Publisher
DOI
10.1016/j.optcom.2009.02.066

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The tunneling-induced optical properties in weak probe pulse propagation are investigated through a quadruple quantum dot (QQD) molecule composed of a center dot and three satellite dots. The dynamic control of pulse propagation is addressed by solving the Maxwell–Bloch equations for the QQD medium and field simultaneously in space and time. It is found that by properly adjusting the system parameters, an absorptive case for the probe pulse can be switched to a case in which the light pulse propagates without significant absorption for quite a long propagation distance. An analytical solution is presented to comprehend such a controllable switch. Finally, it is shown that it is possible to store and retrieve the probe pulse in such a QQD system through adiabatically varying the tunneling couplings. The proposed scheme may provide a guideline to develop a new type of optical storage device.
We study infrared-light propagation and dynamical control of a tunable three-level system in a driven quantum-dot (QD) molecule by means of interdot tunnelling instead of a pumping laser. By numerically solving coupled Bloch?Maxwell equations, it is shown that under the resonant tunnelling condition, an interband (IB) infrared-light pulse acting as a 'signal' can propagate with transparency due to the strong tunnelling-induced coupling. However, when the applied bias voltage tilts the energy levels of the structure such that the levels of the different dots move out of resonance (i.e., the nonresonant tunnelling), with an increase of detuning ?12, the coupling efficiency of interdot tunnelling decreases considerably and the IB infrared-light pulse will be almost completely absorbed after a characteristic propagation length. This can work as an absorptive optical switch where a signal (IB infrared light) is fully controlled by the external bias voltage. Our calculations provide a guideline for the development of new types of nanoelectronic devices in the QD solid-state system, which is much more practical than that in an atomic system because of its flexible design and the controllable (tunable) interference strength.
We investigate the dynamic propagation of a probe field via the tunneling-induced interference effect in a triple model of quantum dot molecules. By theoretical analysis and numerical simulation, we find that the number of transparency window relate to the energy splitting and the group velocity of probe field can be effectively controlled by the tunneling coupling intensity. In addition, in the process of light storage and retrieval, when the excited states have no energy splitting in the storage stage but opposite values of the energy splitting in the retrieval stage, the beating signals can be generated.