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8 Oct 2007

Volume 91, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 91, 153101 (2007); http://dx.doi.org/10.1063/1.2793688 (3 pages)

B. J. Lee, K. Park, and Z. M. Zhang
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Substrate heating influence on plume propagation during pulsed laser deposition of complex oxides

A. Sambri, S. Amoruso, X. Wang, M. Radovic’, F. Miletto Granozio, and R. Bruzzese

Appl. Phys. Lett. 91, 151501 (2007); http://dx.doi.org/10.1063/1.2795792 (3 pages) | Cited 14 times

Online Publication Date: 8 October 2007

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We investigate the effects of the substrate-heater temperature on the expansion dynamics of laser plumes of complex oxides in oxygen atmosphere. We observed a considerable reduction of the background gas resistance to plume propagation as the substrate temperature was increased, leading to a remarkable change in the velocity of the species impacting the substrate during film growth. The deposition temperature thus influences film growth not only through its direct thermal effect on surface kinetics of adatoms, but also by affecting the energetic properties of the precursors in the gas phase. We interpret the results with a simplified model of plume front propagation, accounting for the change in the background gas density induced by the substrate temperature.
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81.15.Fg Pulsed laser ablation deposition
81.15.-z Methods of deposition of films and coatings; film growth and epitaxy

Comparative study of atmospheric pressure low and radio frequency microjet plasmas produced in a single electrode configuration

Dan Bee Kim, J. K. Rhee, B. Gweon, S. Y. Moon, and W. Choe

Appl. Phys. Lett. 91, 151502 (2007); http://dx.doi.org/10.1063/1.2794774 (3 pages) | Cited 34 times

Online Publication Date: 11 October 2007

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Microsize jet-type plasmas were generated in a single pin electrode structure source for two separate input frequencies of 50 kHz and 13.56 MHz in the ambient air. The copper pin electrode radius was 360 μm, and it was placed in a Pyrex tube with a radius of 3 mm for helium gas supply. Due to the input frequency difference, the generated plasmas showed distinct discharge characteristics for their plasma physical appearances, electrical properties, gas temperatures, and optical properties. Strengths and weaknesses of both plasmas were discussed for further applications.
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52.75.-d Plasma devices
52.50.Dg Plasma sources
52.80.-s Electric discharges
52.25.Fi Transport properties
52.25.Os Emission, absorption, and scattering of electromagnetic radiation

Suppression of suprathermal ions from a colloidal microjet target containing SnO2 nanoparticles by using double laser pulses

Takeshi Higashiguchi, Masanori Kaku, Masahito Katto, and Shoichi Kubodera

Appl. Phys. Lett. 91, 151503 (2007); http://dx.doi.org/10.1063/1.2799175 (3 pages) | Cited 7 times

Online Publication Date: 12 October 2007

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We have demonstrated suppression of suprathermal ions from a colloidal microjet target plasma containing tin-dioxide (SnO2) nanoparticles irradiated by double laser pulses. We observed a significant decrease of the tin and oxygen ion signals in the charged-state-separated energy spectra when double laser pulses were irradiated. The peak energy of the singly ionized tin ions decreased from 9 to 3 keV when a preplasma was produced. The decrease in the ion energy, considered as debris suppression, is attributed to the interaction between an expanding low-density preplasma and a main laser pulse.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.25.Jm Ionization of plasmas
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