中国物理B ›› 2017, Vol. 26 ›› Issue (12): 124207-124207.doi: 10.1088/1674-1056/26/12/124207

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

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

Alireza Lotfian, Reza Yadipour, Hamed Baghban   

  1. 1. Department of Electrical and Computer Engineering, University of Tabriz, Tabriz 5166614761, Iran;
    2. School of Engineering-Emerging Technologies, University of Tabriz, Tabriz 5166614761, Iran
  • 收稿日期:2017-04-25 修回日期:2017-08-03 出版日期:2017-12-05 发布日期:2017-12-05
  • 通讯作者: Alireza Lotfian E-mail:Lotfian@tabrizu.ac.ir

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

Alireza Lotfian1, Reza Yadipour1, Hamed Baghban2   

  1. 1. Department of Electrical and Computer Engineering, University of Tabriz, Tabriz 5166614761, Iran;
    2. School of Engineering-Emerging Technologies, University of Tabriz, Tabriz 5166614761, Iran
  • Received:2017-04-25 Revised:2017-08-03 Online:2017-12-05 Published:2017-12-05
  • Contact: Alireza Lotfian E-mail:Lotfian@tabrizu.ac.ir

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摘要： 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 (nbgd) 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 nbgd 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.

关键词: photonic crystal, quantum dot, slow light, semiconductor optical amplifier

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 (nbgd) 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 nbgd 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.

Key words: photonic crystal, quantum dot, slow light, semiconductor optical amplifier

中图分类号:  (Quantum description of interaction of light and matter; related experiments)

  • 42.50.Ct
42.50.Nn (Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)