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10 Mar 2008

Volume 92, Issue 10, Articles (10xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 92, 102101 (2008); http://dx.doi.org/10.1063/1.2890735 (3 pages)

Qing Wan, Jin Huang, Zhong Xie, Taihong Wang, Eric N. Dattoli, and Wei Lu
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Directional excitation of surface plasmons with subwavelength slits

Ting Xu, Yanhui Zhao, Dachun Gan, Changtao Wang, Chunlei Du, and Xiangang Luo

Appl. Phys. Lett. 92, 101501 (2008); http://dx.doi.org/10.1063/1.2894183 (3 pages) | Cited 28 times

Online Publication Date: 10 March 2008

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We propose a method to manipulate the excitation direction of surface plasmons using subwavelength slits fabricated in a metallic film. By designing the specific effective index for each slit, the relative phase of plasmonics generated at the slit exit aperture can be tailored. Therefore, the electromagnetic field intensity along one direction on the metal surface can be enhanced or suppressed by surface plasmon interference. Numerical calculations performed by the finite-difference time-domain method illustrate our theoretical design.
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73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

Stereo-photography of streamers in air

S. Nijdam, J. S. Moerman, T. M. P. Briels, E. M. van Veldhuizen, and U. Ebert

Appl. Phys. Lett. 92, 101502 (2008); http://dx.doi.org/10.1063/1.2894195 (3 pages) | Cited 17 times

Online Publication Date: 10 March 2008

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Standard photographs of streamer discharges show a two-dimensional projection. Here, we present stereophotographic images that resolve their three-dimensional structure. We describe the stereoscopic setup and evaluation, and we present results for positive streamer discharges in air at 0.2–1 bar in a point-plane geometry with a gap distance of 14 cm and a voltage pulse of 47 kV. In this case, an approximately Gaussian distribution of branching angles of 43°±12° is found; these angles do not significantly depend on the distance from the needle or on the gas pressure.
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52.80.-s Electric discharges
52.70.Kz Optical (ultraviolet, visible, infrared) measurements

Spatial dynamics of the light emission from a microplasma array

J. Waskoenig, D. O’Connell, V. Schulz- von der Gathen, J. Winter, S.-J. Park, and J. G. Eden

Appl. Phys. Lett. 92, 101503 (2008); http://dx.doi.org/10.1063/1.2894227 (3 pages) | Cited 13 times

Online Publication Date: 10 March 2008

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The spatial dynamics of the optical emission from an array of 50×50 individual microplasma devices is reported. The array is operated in noble gas at atmospheric pressure with an ac voltage. The optical emission is analyzed with phase and space resolution. It has been found that the emission is not continuous over the entire ac period, it occurs only twice in each cycle. Each of the observed emission phases shows a self-pulsing of the discharge, with several bursts of emission of a fixed width and repetition rate. Cross-talk between the individual devices can be observed through spatially resolved measurements.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.50.Dg Plasma sources
52.80.Dy Low-field and Townsend discharges
52.70.Kz Optical (ultraviolet, visible, infrared) measurements

Ozone production by nanoporous dielectric barrier glow discharge in atmospheric pressure air

J. H. Cho, I. G. Koo, M. Y. Choi, and W. M. Lee

Appl. Phys. Lett. 92, 101504 (2008); http://dx.doi.org/10.1063/1.2887903 (3 pages) | Cited 5 times

Online Publication Date: 11 March 2008

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This study is aimed at demonstrating plasma-chemical ozone production based on low temperature atmospheric pressure glow discharge through nanoporous dielectric barriers. The 20 kHz ac driven discharge is formed in air or oxygen gas flowing in the axial direction of the cylindrical plasma reactor containing four parallel aluminum rods covered with nanoporous alumina films. The discharge utilizing nanoporous dielectric barrier is more uniform and more energy efficient in ozone generation than the discharge through smooth-surface dielectric barriers.
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52.80.Hc Glow; corona
52.50.-b Plasma production and heating
82.33.Xj Plasma reactions (including flowing afterglow and electric discharges)
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