Publications by Justin Wark


Ultrafast laser-matter interaction with nanostructured targets

X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XIII; 111110L (2019) Society of Photo-Optical Instrumentation Engineers (SPIE) 11111 (2019)

RS Marjoribanks, L Lecherbourg, JE Sipe, G Kulcsar, A Heron, J-C Adam, A Miscampbell, G Thomas, R Royle, O Humphries, RHH Ko, S Le Moal, A Tan, J Li, TR Preston, Q van den Berg, M Kasim, B Nagler, E Galtier, E Cunningham, JS Wark, S Vinko

Conventional solid-density laser-plasma targets quickly ionize to make a plasma mirror, which largely reflects ultra-intense laser pulses. This Fresnel reflection at the plane boundary largely wastes our e orts at ultra-intense laser/solid interaction, and limits target heating to nonlinear generation of high-energy electrons which penetrate inward. One way around this dual problem is to create a material with an anisotropic dielectric function, for instance by nanostructuring a material in such a way that it cannot support the material responses which generate a specularly reflected beam. We present linear theory for metallic and plasma nanowires, particle-incell simulations of the interaction of ultra-intense femtosecond pulses with nickel nanowires, showing penetration of laser light far deeper than a nickel skin-depth, helping to uniformly heat near-solid material to conditions of high energy-densities, and XFEL experiments giving insight into their ionization and excitation.


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