Physics – Plasma Physics
Scientific paper
2002-04-09
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.
Ayyub Pushan
Kumar R. Ravindra G.
Rajeev Paramel Pattathil
Sandhu Amanjit S.
Taneja P.
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