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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Phase and amplitude control of optical bistability in quantum dot molecules

Mohammad Mahmoudi, Azar Vafafard, N. Nozari, S. Goharshenasan Esfahani

Published Oct 29, 2010• 1 citation
Publisher

Abstract

We investigate the optical bistability (OB) behavior in a unidirectional ring cavity containing an asymmetric semiconductor double quantum dot (QD) system that forms a three-level V type system. We apply a probe and a coupling field to the system and it is shown that in the presence of inter-dot tunneling, the bistability of the system can be controlled by amplitude and relative phase of applied fields.

DOI
10.1117/12.891385

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We investigate the optical bistability (OB) behavior in a unidirectional ring cavity containing an asymmetric semiconductor double quantum dot (QD) system that forms a three-level V type system. We apply a probe and a coupling field to the system and it is shown that in the presence of inter-dot tunneling, the bistability of the system can be controlled by amplitude and relative phase of applied fields.
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The optical bistability (OB) in the quantum dot molecules with four energy levels in a unidirectional ring cavity has been investigated. The authors find that the OB behaviour in the proposed system can be controlled by the system's different parameters such as electronic cooperation parameter, Rabi frequency of the two coupling laser field, decay rate, three frequency detuning, in which the parameters sensitivity is studied. The proposed system can be used for all optical switching and logic.
In this paper, our aim is to control optical bistability (OB) and optical multistability (OM) in a five-level system designed in a double quantum dot (QD) nanostructure. In a realistic example, this atomic system is created in two semiconductor QDs (In(x)Ga(1-x)N/GaN), owning transfer of carriers via tunneling effect. OB behavior is controlled not only by the inter-dot tunneling effect but also by variation of probe detuning and intensity of the control field. It is demonstrated that voltage-controlled detuning can significantly affect the behavior of OB and OM; therefore, the OM converts to OB by probe detuning and intensity of the control field.
We analyze the optical bistability (OB) behavior in a multifold quantum dot (QD) molecule composed of five quantum dots controlled by the tunneling coupling. It is shown that the optical bistability can strongly be affected by the tunneling inter-dot coupling coefficients as well as detuning parameters. In addition, we find that the rate of an incoherent pump field has a leading role in modification of the OB threshold. We then generalize our analysis to the case of multifold quantum dot molecules where the number of the quantum dots is N (with a center dot and satellite dots). We compare the OB features that could occur in a multifold QD system consist of three ( ), four ( ), and five ( N = 5) quantum dots. We realize that the OB threshold increases as the number of satellite QDs increases. Such controllable optical bistability in multiple QD molecules may provide some new possibilities for technological applications in optoelectronics and solid-state quantum information science.
We investigate the optical properties of a weak probe field in an asymmetry semiconductor double QDs system. We apply a coupling and a probe field to the system and it is shown that in the presence of interdot tunneling, the dispersion and absorption properties of the system can be controlled by the amplitude and relative phase of applied fields. Moreover, it is demonstrated that just by changing the relative phase of applied fields, the slope of dispersion is changed from positive to negative, corresponding to the superluminal light propagation.