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6 Apr 2009

Volume 94, Issue 14, Articles (14xxxx)

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Appl. Phys. Lett. 94, 141901 (2009); http://dx.doi.org/10.1063/1.3111813 (3 pages)

G. S. Huang (黄高山), S. Kiravittaya, V. A. Bolaños Quiñones, F. Ding (丁飞), M. Benyoucef, A. Rastelli, Y. F. Mei (梅永丰), and O. G. Schmidt
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Fast imaging of laser-blow-off plume: Lateral confinement in ambient environment

Sony George, Ajai Kumar, R. K. Singh, and V. P. N. Nampoori

Appl. Phys. Lett. 94, 141501 (2009); http://dx.doi.org/10.1063/1.3111441 (3 pages) | Cited 7 times

Online Publication Date: 7 April 2009

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The dynamics of plasma plume, formed by the laser-blow-off of multicomponent LiF-C thin film under various ambient pressures ranging from high vacuum to argon pressure of 3 Torr, has been studied using fast imaging technique. In vacuum, the plume has ellipsoidal shape. With the increase in the ambient pressure, sharp plume boundary is developed showing a focusing-like (confinement in the lateral space) behavior in the front end, which persists for long times. At higher ambient pressure (>10−1 Torr), structures are developed in the plasma plume due to hydrodynamic instability/turbulences.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.40.Hf Plasma-material interactions; boundary layer effects
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
79.20.Ds Laser-beam impact phenomena

Bacterial inactivation using atmospheric pressure single pin electrode microplasma jet with a ground ring

Sun Ja Kim, T. H. Chung, S. H. Bae, and S. H. Leem

Appl. Phys. Lett. 94, 141502 (2009); http://dx.doi.org/10.1063/1.3114407 (3 pages) | Cited 20 times

Online Publication Date: 8 April 2009

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Bacterial inactivation experiment was performed using atmospheric pressure microplasma jets driven by radio-frequency wave of 13.56 MHz and by low frequency wave of several kilohertz. With addition of a ground ring electrode, the discharge current, the optical emission intensities from reactive radicals, and the sterilization efficiency were enhanced significantly. When oxygen gas was added to helium at the flow rate of 5 SCCM, the sterilization efficiency was enhanced. From the survival curve of Escherichia coli, the primary role in the inactivation was played by reactive species with minor aid from heat, UV photons, charged particles, and electric fields.
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87.53.-j Effects of ionizing radiation on biological systems
52.75.-d Plasma devices
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