Broadrange tunable slow and fast light in quantum dot photonic crystal structure

doi:10.1088/1674-1056/26/12/124207

Abstract Slow and fast light processes, based on both structural and material dispersions, are realized in a wide tuning range in this article. Coherent population oscillations (CPO) in electrically tunable quantum dot semiconductor optical amplifiers lead to a variable group index ranging from the background index (n_bgd) to~30. A photonic crystal waveguide is then dispersion engineered and a group index of 260 with the normalized delay-bandwidth product (NDBP) of 0.65 is achieved in the proposed waveguide. Using comprehensive numerical simulations, we show that a considerable enhancement of slow light effect can be achieved by combining both the material and the structural dispersions in the proposed active QDPCW structure. We compare our developed FDTD results with analytical results and show that there is good agreement between the results, which demonstrates that the proposed electrically-tunable slow light idea is obtainable in the QDPCW structure. We achieve a total group index in a wide tuning range from n_bgd to~1500 at the operation bandwidth, which shows a significant enhancement compared with the schemes based only on material or structural dispersions. The tuning range and also NDBP of the slow light scheme are much larger than those of the electrically tunable CPO process.

Keywords: photonic crystal quantum dot slow light semiconductor optical amplifier

Received: 25 April 2017
Revised: 03 August 2017
Accepted manuscript online:

PACS:	42.50.Ct	(Quantum description of interaction of light and matter; related experiments)
	42.50.Nn	(Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)

Corresponding Authors: Alireza Lotfian
E-mail: Lotfian@tabrizu.ac.ir

Cite this article:

Alireza Lotfian, Reza Yadipour, Hamed Baghban Broadrange tunable slow and fast light in quantum dot photonic crystal structure 2017 Chin. Phys. B 26 124207

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Broadrange tunable slow and fast light in quantum dot photonic crystal structure

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