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Science 8 February 1991:
Vol. 251. no. 4994, pp. 633 - 639
DOI: 10.1126/science.251.4994.633
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Articles

Mesoscopic Conductors and Correlations in Laser Speckle Patterns

SHECHAO FENG 1 and PATRICK A. LEE 2

1 Department of Physics, University of California, Los Angeles, CA 90024, and II. Physikalisches Institut, Universität zu Köln, 5000 Köln 41, Germany
2 The Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139

Submicrometer disordered metallic systems at low temperatures display interesting conductance fluctuation effects, owing to the interference of coherent electron wave transmission through the system. This quantum interference phenomenon also gives rise to the striking experimental observation that the 1/f noise power (where f is frequency) in disordered conductors increases as the temperature is decreased, contrary to common intuition. The theoretical techniques developed for this problem can be applied to the transmission of light through a random medium, and this yields novel predictions for the correlations in the laser speckle patterns and the possibility of studying the positions and motions of scatterers in a medium which multiply scatter the probing light.


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