Department of Physics, Engineering Physics & Astronomy

Queen's University
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Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

CMP Seminar-  "Extreme light in nanostructured targets: shaping fields and managing particle flows"

Robin S. Marjoribanks,

Thursday, February 12th, 2015
10:30 am @ Stirling 401


The more intense that laser pulses can be made, the more surprising and extreme are the interaction effects researchers are seeing -- effects that are sometimes hard to control. One way to guide or redirect the physics relationships is to manipulate the composition or wavelength-scale structure of targets. Nickel nanowires present >95% optical absorption into an effective skin-depth that is very long, greater than 1 ?m. Partly this is due to the strong optical anisotropy of these oriented nanostructures: at low intensities they're dielectric in the transverse direction and conductors along the optical axis. Under intense irradiation, and especially at relativisitic optical intensities, this can lead to global transition from dielectric to conductor, strong J×B effects, nonlinear acceleration of electrons and the generation of high harmonic radiation. I'll outline the physics of ultra-intense interaction, and talk about our new theoretical and experimental results for intensities from small-signal up to very clean relativistic pulses.