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Vacuum-Rabi and Autler-Townes Splitting in Quantum Dot Molecules Embedded in Coupled Cavities
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DOI：10.1002/qute.70318.png)
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Abstract
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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 106 is revealed. Such a system may be used in on-chip QD-based optical devices.
Keywords:
Quantum dot molecules
Coupled cavities
Autler-Townes splitting
Vacuum-Rabi splitting
Transparency windows
Journal
A
IF:
4.3
Papers:
387
Citations:
3.2K
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Cited Papers