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28 May 2007

Volume 90, Issue 22, Articles (22xxxx)

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Appl. Phys. Lett. 90, 221101 (2007); http://dx.doi.org/10.1063/1.2743884 (3 pages)

Siyka I. Shopova, Hongying Zhou, Xudong Fan, and Po Zhang
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Optical properties of helical Ag nanostructures calculated by discrete dipole approximation method

Z.-Y. Zhang and Y.-P. Zhao

Appl. Phys. Lett. 90, 221501 (2007); http://dx.doi.org/10.1063/1.2743938 (3 pages) | Cited 15 times

Online Publication Date: 29 May 2007

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The extinction spectra and field distribution of Ag helical nanostructures have been calculated using the discrete dipole approximation method. The plasmon peak of the Ag helix can be tuned not only by the structural parameters but also by the polarizations of the incident light, especially the circular polarizations. In addition, the polarization direction of the incident light can change the spatial distribution of the maximum E field, which provides a simple way to spatially resolve analyte’s distribution on the nanostructures for sensing applications.
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78.67.Bf Nanocrystals, nanoparticles, and nanoclusters
78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
71.45.Gm Exchange, correlation, dielectric and magnetic response functions, plasmons

Enhanced performance of cylindrical Hall thrusters

Y. Raitses, A. Smirnov, and N. J. Fisch

Appl. Phys. Lett. 90, 221502 (2007); http://dx.doi.org/10.1063/1.2741413 (3 pages) | Cited 14 times

Online Publication Date: 30 May 2007

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The cylindrical thruster differs significantly in its underlying physical mechanisms from the conventional annular Hall thruster. It features high ionization efficiency, quiet operation, ion acceleration in a large volume-to-surface ratio channel, and performance comparable with the state-of-the-art conventional Hall thrusters. Very significant plume narrowing, accompanied by the increase of the energetic ion fraction and improvement of ion focusing, led to 50%–60% increase of the thruster anode efficiency. These improvements were achieved by overrunning the discharge current in the magnetized thruster plasma.
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52.75.Di Ion and plasma propulsion
52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.25.Jm Ionization of plasmas
52.25.Fi Transport properties
52.25.Xz Magnetized plasmas

Spherical carbon liquids generated in a low pressure CH4/Ar plasma

Zongbao Feng, Akihiko Kono, Tatsuzo Nagai, and Fumiya Shoji

Appl. Phys. Lett. 90, 221503 (2007); http://dx.doi.org/10.1063/1.2745201 (3 pages) | Cited 2 times

Online Publication Date: 31 May 2007

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The authors present a study on spherical carbon particles of micron sizes grown in the plasma sheath as spherical liquids that can be agglomerated by capillary force based on the Laplace pressure. In addition, it is suggested that those spherical carbon liquids with negative charges that are levitating in the sheath region begin to display a collective behavior of Coulomb crystals.
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52.77.Dq Plasma-based ion implantation and deposition
52.40.Kh Plasma sheaths
81.05.U- Carbon/carbon-based materials

Self-organized pattern formation of an atmospheric pressure plasma jet in a dielectric barrier discharge configuration

Qiu-Yue Nie, Chun-Sheng Ren, De-Zhen Wang, Shou-Zhe Li, Jia-Liang Zhang, and M. G. Kong

Appl. Phys. Lett. 90, 221504 (2007); http://dx.doi.org/10.1063/1.2745204 (3 pages) | Cited 13 times

Online Publication Date: 31 May 2007

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This letter reports the observation of self-organized patterns formed in a 29 mm wide atmospheric pressure plasma jet. By altering the gas flow rate and/or the applied voltage, the plasma jet is seen to have at least three different modes, namely, a diffuse-looking discharge, a self-organized discharge, and an unstable discharge with randomly occurring plasma channels. The self-organized discharge mode is characterized by several bright plasma channels embedded in a diffuse and dim plasma background. These plasma channels are regularly spaced from each other and their self-organized patterns are shown to evolve abruptly.
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52.50.Dg Plasma sources
52.80.-s Electric discharges
52.25.Fi Transport properties
52.35.Qz Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.)
52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)
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