Low threshold optical bistability and superluminal light propagation using a dielectric slab via inter-dot tunneling

The optical bistability (OB) behavior of a dielectric slab doped with quantum dot (QD) molecules is investigated in the presence of the inter-dot tunneling effect. It is shown that the threshold point of OB reduces by increasing inter-dot tunneling as well as by reducing the slab thickness. It is wo...

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Bibliographic Details
Published in:Laser physics 2015-04, Vol.25 (4), p.45901
Main Authors: Taherzadeh, S, Nasehi, R, Mahmoudi, Mohammad
Format: Article
Language:English
Subjects:
dielectric slab
optical bistability
quantum dot molecule
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Summary:The optical bistability (OB) behavior of a dielectric slab doped with quantum dot (QD) molecules is investigated in the presence of the inter-dot tunneling effect. It is shown that the threshold point of OB reduces by increasing inter-dot tunneling as well as by reducing the slab thickness. It is worth noting that the threshold of OB in a slab doped with QD molecules is smaller, by at least one order of magnitude, in respect to free QD molecules. We find that the inter-dot tunneling induces a negative group delay to the reflected pulse and it propagates in the superluminal region. Such simple control can be used in all optical switching.
ISSN:1054-660X
1555-6611
DOI:10.1088/1054-660X/25/4/045901