Metal nanoplasmas as bright sources of hard x-ray pulses

Details Metal nanoplasmas as bright sources of hard x-ray pulses Metal nanoplasmas as bright sources of hard x-ray pulses

2002-04-09

arxiv.org/abs/physics/0204027v3

Physics

Plasma Physics

4pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.90.115002

We demonstrate a 13-fold increase in hard x-ray bremsstrahlung (10 - 200 keV) emitted by a copper plasma created by 100 fs, 806 nm pulses at $10^{14}-10^{15}$ Wcm$^{-2}$. This enhancement is achieved by roughening the target surface with copper nanoparticles of ~15 nm size. A simple model that invokes local field modifications by surface plasmon excitation and `lightning rod' effects explains the observed enhancement quantitatively and provides pointers to the design of structured surfaces for maximizing the emission.

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