Capture and release of photonic images in a quantum well

Krauß, J.; Kotthaus, J. P.; Wixforth, A.; Hanson, M.; Driscoll, D. C.; Gossard, A. C.; Schuh, D.; Bichler, M.
December 2004
Applied Physics Letters;12/13/2004, Vol. 85 Issue 24, p5830
Academic Journal
The capture of an optical image in the plane of a semiconductor quantum well and the subsequent re-emission of this image in the form of a two-dimensional photon flux is demonstrated. Spatially resolved storage of photonic signals in a two-dimensional lateral potential landscape of the quantum well is employed to imprint optical images in the form of trapped photogenerated charges into the solid. The lateral two-dimensional potential modulation leads to very long storage times by a deliberate spatial separation of photogenerated electron–hole pairs. Once the potential modulation is lifted, the initial optical information is restored and the photographed image is released in a flash of light.


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