Abstract
Nonlinear optical processes in highly conductive materials, produce fast and strong changes in their refractive index. Using nanostructuring, further enhancement of this Kerr-type nonlinearity, determined by free-electron dynamics in strong electromagnetic fields, can be achieved through increased light-matter interactions [1]. However, although the initial change in optical properties occurs over femtosecond time scales, the relaxation of the excited electrons is governed by electron cooling, which may take place generally over several picoseconds.
© 2017 IEEE
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