25 September 2007 Functional photonic band gap structures based on electromagnetically induced transparency in the conduction intersubband transitions of quantum wells
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Abstract
In an active photonic band gap structure, a control laser can manipulate the probe signal coherently if the probe field satisfies the Bragg condition and is resonant or near resonant with the electronic or excitonic transitions of the constituting material structure. Using coherent effects in the conduction intersubband transitions of an n-doped quantum well, recently, we showed that one could convert a fully transparent waveguide into an active photonic band gap. Such an active photonic band gap was different from those based on superradiant excitons in two main issues: (i) the probe field was near resonant with the conduction intersubband transitions of the quantum well, and (ii) one needed a control field to generate the coherent effects and, thereafter, the band gap. Here we use such coherent processes, which include electromagnetically induced transparency and coherent enhancement of refractive index, to study a one-dimensional functional photonic band gap structure. In the absence of a control laser field such a structure acts as a conventional photonic band gap created by an off-resonant (background) refractive index perturbation. In other words, the probe field does not feel any resonance in this structure and the photonic band gap is passive. In the presence of the control field, the structure is activated and transformed into a resonant structure. Under this condition, the probe field becomes near resonant with the intersubband transitions while still satisfies the Bragg condition. We study how the coherent effects in such transitions can lead to destruction and enhancement of the photonic band gap in a waveguide structure.
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Wei Li, Wei Li, Seyed M. Sadeghi, Seyed M. Sadeghi, Xun Li, Xun Li, Wei-Ping Huang, Wei-Ping Huang, "Functional photonic band gap structures based on electromagnetically induced transparency in the conduction intersubband transitions of quantum wells", Proc. SPIE 6640, Active Photonic Crystals, 66400H (25 September 2007); doi: 10.1117/12.733323; https://doi.org/10.1117/12.733323
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