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Science 17 December 1999:
Vol. 286. no. 5448, p. 2229
DOI: 10.1126/science.286.5448.2229m
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This Week in Science

Optically based circuitry will need a method for storing and retrieving optical signals similar to the static and dynamic memory devices currently used in electronics. Lundstrom et al. (p. 2312) report a storage medium based on two coupled quantum dots. A photon creates an electron-hole pair, which separates and then is stored separately on the two quantum dots. After several seconds, an applied bias brings the electron and hole together again. This recombination event re-emits a photon, but the overall delay in recombination brought about by storage is about ten orders of magnitude longer than the natural decay time of an electron-hole pair. [See the Perspective by Kotthaus.]




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Science. ISSN 0036-8075 (print), 1095-9203 (online)