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Proceedings Paper

Superradiative decay and enhanced optical nonlinearity of low-dimensional excitons
Author(s): Eiichi Hanamura
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Paper Abstract

We want to make the best use of the mesoscopic or macroscopic transition dipolemornent of excitons by controling the size and dimension of the materials. First, the semiconductor microcrystallites embedded in insulators or glasses are shown to have the mesoscopic transition dipolemoment of excitons1 . As a result, the exciton in CuC1 microcrystallite with the radius 80 A superradiatively decays in 100 pico-second2. Futhermore, the exciton-exciton interaction and the decay and relaxation of the exciton work effectively in deviating the excitons in the microcrystallite from ideal bosons and this system shows the large third-order optical susceptibility"3 of an order of iO esu when we assume the 0.1% packing of the CuC1 microcrystallites. These predictions have been confirmed expriment ally4'5. Second, the two-dimensional excitons in quantum wells can superradiatively decay in the direction perpendicular to the surfaces2 . This brings about the quick response and the deviation of the excitons from ideal bosons at the same time. The latter effect as well as the two-dimensional macroscopic enhancement of the exction transition dipolemoment enhance the third-order optical susceptibility3. Both the superradiative decay rate and increase as does the coherent length, which is inversely proportional to the square root of the exciton line width6.

Paper Details

Date Published: 1 August 1990
PDF: 10 pages
Proc. SPIE 1268, Applications of Ultrashort Laser Pulses in Science and Technology, (1 August 1990); doi: 10.1117/12.20326
Show Author Affiliations
Eiichi Hanamura, Univ. of Tokyo (United States)

Published in SPIE Proceedings Vol. 1268:
Applications of Ultrashort Laser Pulses in Science and Technology
Andre Antonetti, Editor(s)

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