Laser-driven ultrafast field propagation on solid surfaces.
The interaction of a 3x10;{19} W/cm;{2} laser pulse with a metallic wire has been investigated using proton radiography. The pulse is observed to drive the propagation of a highly transient field along the wire at the speed of light. Within a temporal window of 20 ps, the current driven by this field rises to its peak magnitude approximately 10;{4} A before decaying to below measurable levels. Supported by particle-in-cell simulation results and simple theoretical reasoning, the transient field measured is interpreted as a charge-neutralizing disturbance propagated away from the interaction region as a result of the permanent loss of a small fraction of the laser-accelerated hot electron population to vacuum.
Quinn
K
K
Department of Physics and Astronomy, Queen's University Belfast, Belfast BT7 1NN, United Kingdom. kquinn09@qub.ac.uk
Wilson
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Cecchetti
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Ramakrishna
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Romagnani
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Sarri
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Lancia
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Fuchs
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Pipahl
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Toncian
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Willi
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Clarke
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Neely
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Notley
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Gallegos
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Carroll
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Quinn
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Yuan
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McKenna
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Liseykina
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Macchi
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Borghesi
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