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31 May 2004

Volume 84, Issue 22, pp. 4361-4576

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Appl. Phys. Lett. 84, 4409 (2004); http://dx.doi.org/10.1063/1.1757648 (3 pages)

Azita Soleymani, Piroz Zamankhan, and William Polashenski
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Characterization of laser-produced aluminum plasma in ambient atmosphere of nitrogen using fast photography

A. K. Sharma and R. K. Thareja

Appl. Phys. Lett. 84, 4490 (2004); http://dx.doi.org/10.1063/1.1756199 (3 pages) | Cited 13 times

Online Publication Date: 14 May 2004

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We report on the pulsed-laser ablation of aluminum in ambient pressure of nitrogen varying from 0.01 to 70 Torr using images of the expanding plasma plume. At pressures ≥ 1 Torr plasma–gas interface showed severe distortion in the front of the expanding plume. The plasma expansion velocity showed oscillatory behavior with delay time beyond 260 ns and is attributed to Rayleigh–Taylor instability. The effect of background gas on inducing polarization in the ablated plasma is also reported. At low pressure of 0.1 Torr the degree of polarization of Al III transition 4s 2S1/2–4p 2P3/20 at 569.6 nm increased with delay time. At pressures ≥ 1 Torr it showed an oscillatory behavior. The observed steep pressure gradient at the plasma–gas interface may result in strong self-generated magnetic field due to Rayleigh–Taylor instability. © 2004 American Institute of Physics.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)
52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.65.Kj Magnetohydrodynamic and fluid equation
52.35.Tc Shock waves and discontinuities
52.38.Mf Laser ablation

Generation of silicon nanoparticles via femtosecond laser ablation in vacuum

S. Amoruso, R. Bruzzese, N. Spinelli, R. Velotta, M. Vitiello, X. Wang, G. Ausanio, V. Iannotti, and L. Lanotte

Appl. Phys. Lett. 84, 4502 (2004); http://dx.doi.org/10.1063/1.1757014 (3 pages) | Cited 66 times

Online Publication Date: 14 May 2004

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We demonstrate that femtosecond laser ablation of silicon targets in vacuum is a viable route to the generation and deposition of nanoparticles with radii of ≈5–10 nm. The nanoparticles dynamics during expansion has been analyzed through their structureless continuum optical emission, while atoms and ions, also present in the plume, have been identified by their characteristic emission lines. Atomic force microscopy analysis of the material deposited at room temperature has allowed the characterization of the nanoparticles size distribution. Taking into account the emissivity of small particles we show that the continuum emission is a blackbody-like radiation from the nanoparticles. Our results suggest that nanoclusters are generated as a result of relaxation processes of the extreme material state reached by the irradiated target surface, in agreement with recently published theoretical studies. © 2004 American Institute of Physics.
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81.07.De Nanotubes
81.05.Cy Elemental semiconductors
68.47.Fg Semiconductor surfaces
61.82.Rx Nanocrystalline materials
78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
81.16.Mk Laser-assisted deposition
78.55.Ap Elemental semiconductors
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
61.82.Fk Semiconductors
61.46.-w Structure of nanoscale materials
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