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Journal of Nonlinear Optical Physics & Materials

Spin coherence control of optical bistability via light hole transition in multiple quantum well waveguide embedded in a dielectric medium

Ghahraman Solookinejad, M. Panahi, Elnaz Ahmadi Sangachin, Seyyed Hossein Asadpour

Published Sep 1, 2016• 5 citations
Publisher

Abstract

In this study, we explore the optical bistability (OB) and multistability (OM) features of probe light propagating in a multiple quantum well (MQW) nanostructure embedded in a dielectric medium. It is realized that via light hole (LH) transition between valance bands and conduction band of MQWs with different electron states, the electron spin coherence can be created which can be used to controlling the OB and OM properties. It is realized that the thickness of dielectric slab can lead to adjusting the threshold of OB in different intensities of input field. Moreover, it is found that the transition from OB to OM or vice versa can be possible by selection of suitable quantity of slab thickness. In addition, the role of relative phase of applied fields on OB and OM manners is discussed in different quantities of thickness. Our results may be suitable for developing nanoscale devices in quantum information science and technologies for future applications.

DOI
10.1142/s0218863516500351

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In this paper, we proposed a new model based on the electron tunneling effect in a four-level quantum dot molecule (QDM) for studying the optical bistability (OB) and optical multistability (OM). The QDM interacts with a probe and two coupling and Laguerre–Gaussian (LG) fields. We found that by adjusting the electron tunneling effect and the parametric controlling of LG light, the transition from OB to OM or vice versa is possible. Moreover, due to the simultaneous interaction between coupling and LG lights with the same optical transition adjusting the threshold of OB and OM by orbital angular momentum (OAM) of the LG light becomes achievable. Our results show that by adjusting the simultaneous effect of electron tunneling and OAM state of the vortex light, the favorable OB and OM patterns with adjustable intensity thresholds are achievable. Our proposed model may have potential application in quantum information science based on quantum dot (QD) devices.
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Abstract In this paper, we have proposed a new model based on the electron tunneling effect for controlling the optical bistability (OB) and optical multistability (OM) in a defect slab structure with a quantum dot molecule (QDM). Due to the presence of the electron tunneling effect, an additional weak signal beam can be generated in the system which makes the medium becomes phase dependent. We have studied the refractive index properties of the QDM via optical susceptibility of the propagated probe light. We have discussed the relative phase effect on negative refractive index (NRI) of the QDM nanostructure due to presence of electron tunneling. Then, by using the transfer matrix method, we have studied the transmission coefficient for NRI of the QDM nanostructure. Then, we have investigated the properties of transmitted light versus incident light for realizing the OB and OM. We have considered the relative phase effect on OB and OM properties of the transmitted beam and find that the switching between them is possible when electron tunneling is present in the quantum dot. Moreover, the optical thickness of the defect layer is also investigated on OB and OM in resonance and non-resonance conditions.