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Slow Light Based on Coherent Population Oscillation in Quantum Dots at Room Temperature

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4 Author(s)
Shu-Wei Chang ; Dept. of Electr. & Comput. Eng., Illinois Univ., Urbana, IL ; Kondratko, Piotr Konrad ; Hui Su ; Chuang, Shun Lien

We develop a model for slow light based on the coherent population oscillation of quantum dots at room temperature. With the absorption dip and corresponding variation of the refractive index due to the coherent population beating induced by the pump and probe signal, quantum dots can be used as a slow-light medium. Our theoretical model matches the experimental results very well. We also experimentally and theoretically demonstrate that both the forward-bias injection current and reverse-bias voltage can change the group index in a semiconductor quantum-dot waveguide. Our results indicate that quantum-dot devices can be potentially used as electrically and optically controllable slow light devices

Published in:

Quantum Electronics, IEEE Journal of  (Volume:43 ,  Issue: 2 )

Date of Publication:

Feb. 2007

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