Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1772584 | High Energy Density Physics | 2012 | 4 Pages |
Abstract
We have measured the time evolution of the phase shift at the front and back surfaces of gold nano-foils that have been excited with a 150 fs (λ = 400 nm) laser pulse. The thickness of the foils (d∼30 nm) is roughly one-third of the ballistic electron transport range at ambient conditions (∼100 nm). At lower pump fluences, the front and back sides of the foil behave similarly, indicating uniform heating by ballistic electrons. As the pump fluence is increased, the phase shift on the front side is higher than that on the back, indicating a significant reduction in the ballistic electron transport range.
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Authors
Tadashi Ogitsu, Yuan Ping, Alfredo Correa, Byoung-ick Cho, Phil Heimann, Eric Schwegler, J. Cao, Gilbert W. Collins,