Surface-plasmon-enhanced MeV ions from femtosecond laser irradiated, periodically modulated surfaces

Bagchi, Suman ; Prem Kiran, P. ; Wang, W. M. ; Sheng, Z. M. ; Bhuyan, M. K. ; Krishnamurthy, M. ; Kumar, G. Ravindra (2012) Surface-plasmon-enhanced MeV ions from femtosecond laser irradiated, periodically modulated surfaces Physics of Plasmas, 19 (3). Article ID 030703. ISSN 1070-664X

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Official URL: http://aip.scitation.org/doi/abs/10.1063/1.3693388...

Related URL: http://dx.doi.org/10.1063/1.3693388

Abstract

Enhanced emission of high energy ions is measured from sub-wavelength metallic grating targets under irradiation by intense (1015−1016 W cm−2), p-polarized, 50 fs, 800 nm laser pulses. The maximum ion energy is 55% higher and the ion flux is 60% higher for the modulated surface in comparison with polished surfaces of the same atomic composition. The ion emission, a result of enhanced light coupling and hot electron production in the grating targets, is correlated with enhancement in hard X-ray bremsstrahlung emission. The results are well reproduced by particle-in-cell simulations. The study reveals that the enhanced laser coupling by surface plasmon excitation on metallic gratings is directly responsible for the enhancement of ion energies.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
ID Code:102634
Deposited On:02 Feb 2018 04:28
Last Modified:02 Feb 2018 04:28

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