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Journal of the Optical Society of America B

Storage and retrieval of light pulse propagating in quadruple quantum dot molecules

Hamid Reza Hamedi

Published Jan 6, 2016• 14 citations
Publisher

Abstract

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.

DOI
10.1364/josab.33.000151

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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.
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Abstract Based on a GaAs/AlGaAs quadruple-coupled quantum dot heterostructure, an optical switch for controlling superluminal and subluminal light propagation is suggested. The transient and steady state behaviour of the absorption and dispersion of a probe pulse laser field through a quadruple quantum dot molecule are studied. We show that the group velocity of a light pulse can be controlled from superluminal to subluminal, or vice versa, by controlling the tunnelling rates between the quantum dots. The required switching time is calculated and we find it to be about 8 ps. We also investigated a method for the all-optical switching of probe field absorption from a large amount to nearly zero just by applying an incoherent pumping field. We estimated the required switching time for this case to be between 3 and 14 ps.
We investigated the steady optical properties of the triple quantum dots, which obtain a tunneling-induced effect by using the external electric field. Our numerical results shown that the electromagnetically induced transparency can be achieved via the tunneling-induced effect. In addition, we examined the propagation dynamics of a probe field in this system and found that the probe field group velocities and their absorption were related to the tunneling coupling intensities. This finding allowed us to control the probe field to obtain ultraslow group velocities and a tunable optical switch. Finally, using this scheme it was possible to store and release the probe field by modulating the tunneling coupling sequences.
We study the propagation properties of a probe field in an aligned asymmetric triple quantum dot molecule with both sides inter-dot tunneling coupling effect. It is shown that the probe field can form optical soliton due to the destructive quantum interference induced by the quantum inter-dot tunneling coupling effect. Interestingly, these optical solitons can be stored and retrieved by adjusting single or double inter-dot tunneling coupling effect, different from that light memory in the ultra-cold atom system. Furthermore, we also find that the amplitude of the stored optical soliton can be adjusted by the strength of the single or double inter-dot tunneling coupling. It is possible to improve the stability and the fidelity of the optical information in the process of the storage and retrieval in semiconductor quantum dots devices.
A switch is proposed for controlling the subluminal and superluminal light propagation through the triple coupled quantum dots system. The steady-state and transient behavior of the absorption and the dispersion of a probe pulse through a triple quantum dots molecule are investigated. We demonstrate that the group velocity of a light pulse can be controlled from subluminal to superluminal or vice versa by controlling the rates of incoherent pumping and tunneling between electronic levels. Switching time is calculated by discussing the dependency of optical transient properties on the incoherent pumping and inter-dot tunneling rates. We introduce three controlling parameters that make it possible to control the wave propagation electrically or even optically in such coupled quantum dot systems.