Condensed Matter Physics Seminar

2 p.m., Thursday, April 27, 2006
Room 1201, Physics Building

 Photon localization and mesoscopic correlation in the time domain

Azriel Genack

(Queen’s College)

Abstract:  Perhaps because the enhancement of fluctuations far from the localization threshold is large, in contrast to the small suppression of transport by weak localization, mesoscopic fluctuations and localization are often seen as distinct phenomena. Isolating these effects and finding the relationship between them is challenging because, on the one hand, steady state electronic conductance and optical transmission involve the superposition of partial waves with all possible pathlengths, while on the other, these effects depend differently upon the length of wave trajectories. Finding the connection between mesoscopic fluctuations and photon localization is further complicated by absorption which leads to an exponential suppression of transport and thereby mimics the behavior of localization. In this talk, we will show that an examination of transport in random media in the time domain allows all these effects to be studied separately. At the same time, we find that fluctuations and localization can each be seen to emerge from the other. We observe the increasing impact of weak localization and the growth of mesoscopic fluctuations and intensity correlation with delay time from an exciting pulse and find the link between the suppression of transport in time and spectral fluctuations of total transmission.
Host:  Anlage
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