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

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.

[1]  P. Ayyub,et al.  Hot ion generation from nanostructured surfaces under intense femtosecond laser irradiation , 2006, physics/0610126.

[2]  O Willi,et al.  Dynamics of electric fields driving the laser acceleration of multi-MeV protons. , 2005, Physical review letters.

[3]  F. J. Garcia-Vidal,et al.  SURFACE SHAPE RESONANCES IN LAMELLAR METALLIC GRATINGS , 1998 .

[4]  Brunel.  Not-so-resonant, resonant absorption. , 1987, Physical review letters.

[5]  Xin Wang,et al.  Enhanced surface acceleration of fast electrons by using subwavelength grating targets , 2010 .

[6]  D. Mathur,et al.  Engineering clusters for table-top acceleration of ions , 2006 .

[7]  D. Forslund,et al.  Theory of hot-electron spectra at high laser intensity , 1977 .

[8]  P. Prem Kiran,et al.  Fast ion beams from intense, femtosecond laser irradiated nanostructured surfaces , 2007 .

[9]  S. V. Bulanov,et al.  Optics in the relativistic regime , 2006 .

[10]  Edward B. Clark,et al.  Energetic heavy-Ion and proton generation from ultraintense laser-plasma interactions with solids , 2000, Physical review letters.

[11]  P P Rajeev,et al.  Metal nanoplasmas as bright sources of hard X-ray pulses. , 2003, Physical review letters.

[12]  J. Roy Sambles,et al.  Sharp Surface-Plasmon Resonances on Deep Diffraction Gratings , 1997 .

[13]  S. Wilks,et al.  Hard x-ray and hot electron production from intense laser irradiation of wavelength-scale particles , 2001 .

[14]  Z. Sheng,et al.  Stochastic heating and acceleration of electrons in colliding laser fields in plasma. , 2002, Physical review letters.

[15]  J. Landry,et al.  Hot electron and x-ray production from intense laser irradiation of wavelength-scale polystyrene spheres , 2007 .

[16]  A. E. Dangor,et al.  Monoenergetic beams of relativistic electrons from intense laser–plasma interactions , 2004, Nature.

[17]  P. Mora,et al.  Plasma expansion into a vacuum. , 2003, Physical review letters.

[18]  Zulfikar Najmudin,et al.  Collimated multi-MeV ion beams from high-intensity laser interactions with underdense plasma. , 2006 .

[19]  Deanna M. Pennington,et al.  Energetic proton generation in ultra-intense laser–solid interactions , 2000 .

[20]  Takashi Kikuchi,et al.  Suppression of transverse proton beam divergence by controlled electron cloud in laser-plasma interactions , 2005 .

[21]  A. Zhidkov,et al.  Emission of MeV multiple-charged ions from metallic foils irradiated with an ultrashort laser pulse , 2000 .

[22]  Roger W. Falcone,et al.  Efficient coupling of high-intensity subpicosecond laser pulses into solids , 1993 .

[23]  C. Joshi,et al.  The development of laser- and beam-driven plasma accelerators as an experimental field , 2007 .

[24]  R. Fonseca,et al.  Ion acceleration from the shock front induced by hole boring in ultraintense laser-plasma interactions. , 2004, Physical review. E, Statistical, nonlinear, and soft matter physics.

[25]  Caterina Riconda,et al.  Efficient laser-overdense plasma coupling via surface plasma waves and steady magnetic field generation , 2011 .

[26]  T. Nishikawa,et al.  Efficient water-window X-ray pulse generation from femtosecond-laser-produced plasma by using a carbon nanotube target , 2004 .

[27]  P. Norreys,et al.  Proton acceleration from high-intensity laser interactions with thin foil targets. , 2003, Physical review letters.

[28]  A. Rao,et al.  Bright, low debris, ultrashort hard x-ray table top source using carbon nanotubes , 2011 .

[29]  R. Sauerbrey,et al.  Soft x‐ray emission from plasmas produced by ultraintense KrF‐laser pulses in colloidal Al , 1996 .

[30]  G. Malka,et al.  Electron Acceleration by a Wake Field Forced by an Intense Ultrashort Laser Pulse , 2002, Science.