All-optical switch based on doped graphene quantum dots in a defect layer of a one-dimensional photonic crystal

We discuss the light pulse propagation in a one-dimensional photonic crystal doped by graphene quantum dots in a defect layer. The graphene quantum dots behave as a three-level quantum system and are driven by three coherent laser fields. It is shown that the group velocity of the transmitted and re...

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Bibliographic Details
Published in:Applied optics (2004) 2018-01, Vol.57 (3), p.521
Main Authors: Sahrai, Mostafa, Abbasabadi, Majid
Format: Article
Language:English
Subjects:
Crystal defects
Graphene
Group velocity
Optical switching
Photonic crystals
Pulse propagation
Quantum dots
Quantum theory
Superluminal propagation
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Summary:We discuss the light pulse propagation in a one-dimensional photonic crystal doped by graphene quantum dots in a defect layer. The graphene quantum dots behave as a three-level quantum system and are driven by three coherent laser fields. It is shown that the group velocity of the transmitted and reflected pulses can be switched from subluminal to superluminal light propagation by adjusting the relative phase of the applied fields. Furthermore, it is found that by proper choice of the phase difference between applied fields, the weak probe field amplification is achieved through a one-dimensional photonic crystal. In this way, the result is simultaneous subluminal transmission and reflection.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.57.000521