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IEEE/LEOS Winter Topical Meeting Series

Application of quantum optical effects in switching

Gianluca Manzacca, Gabriella Cincotti

Published Jan 1, 2008• 0 citations
Publisher

Abstract

We investigate through a formalism similar to a coupled mode theory in time, the behavior of a system composed by a direct coupled cavity with inside it a quantum dot in cascade configuration. We derive the conditions for which switching can be achieved. Two quantum optical effects are considered: vacuum Rabi splitting and the Autler-Town doublet.

DOI
10.1109/leoswt.2008.4444385

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We investigate through a formalism similar to a coupled mode theory in time, the behavior of a system composed by a direct coupled cavity with inside it a quantum dot in cascade configuration. We derive the conditions for which switching can be achieved. Two quantum optical effects are considered: vacuum Rabi splitting and the Autler-Town doublet.
We analyze the behavior of a quantum dot embedded in an add-drop filter for optical signal processing applications. The joint effects of dipole induced transparency and electromagnetic induced transparency, which shift the transparency peak induced by a dipole in an add-drop filter due to vacuum Rabi splitting, have been considered. The mathematical model and some different conditions for tuning the transparency peak are derived for application to all optical switching and wavelength tunable devices.
We analyze the behaviour of a quantum dot embedded in a photonic crystal add-drop filter and in a direct coupled photonic crystal microcavity for optical signal processing applications. The joint effect of dipole induced transparency and electromagnetic induced transparency, considering a cascade configuration of the quantum dot, are used to modify the behaviour of the whole system. The mathematical model and a number of different conditions for tuning the frequency response of the filters are derived for application in all-optical switching and wavelength tunable devices.
ABSTRACT Optical properties in quantum dot molecules (QDMs), which are implanted in coupled cavities, are researched theoretically. The QDMs are composed of three QDs, and a multi‐level system, including direct and indirect excitons, which can be formed due to tunneling effects therein. Under the strong coupling condition, double Autler‐Townes splitting (ATS) occurs. Then, we implant the QDMs in the coupled cavities, and double Vacuum‐Rabi splitting (VBS) is created together. Four transparency windows are demonstrated. Moreover, the effects of the coupling strengths and frequency detunings on the system absorption spectrum are discussed. Especially, the group index in QDMs controlled by the coupling strengths are explored and group velocity with a reduced factor of 10 6 is revealed. Such a system may be used in on‐chip QD‐based optical devices.
Abstract We demonstrate experimental observation of vacuum Rabi splitting (VRS) of four-wave mixing and six-wave mixing in a collective five-level atomic-cavity coupling system. We study the control of VRS via changing the dressing effect of the vacuum cavity mode; i.e., the cavity mode dressing effect can selectively split the right or left peak when cavity-atom detuning and atom number N are changed. We further report that the cavity window and two electromagnetically induced transparency (EIT) windows induced by the dressing field interfere with each other because of different two-photon conditions they satisfy. Additionally, we investigate the self-dressing field effect on VRS of six-wave mixing (SWM) inside the cavity. Such investigation results can find application in all-optical switches and optical communications.