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1 Dec 2008

Volume 93, Issue 22, Articles (22xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 93, 221101 (2008); http://dx.doi.org/10.1063/1.3036234 (3 pages)

Soon Moon Jeong, Na Young Ha, Mu Guen Chee, Fumito Araoka, Ken Ishikawa, Hideo Takezoe, Suzushi Nishimura, and Goro Suzaki
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Microdischarge propagation and expansion in a surface dielectric barrier discharge

A. R. Hoskinson, L. Oksuz, and N. Hershkowitz

Appl. Phys. Lett. 93, 221501 (2008); http://dx.doi.org/10.1063/1.3039805 (3 pages) | Cited 13 times

Online Publication Date: 1 December 2008

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We have recorded light emission from a surface dielectric barrier discharge with one exposed and one insulated electrode using an intensified digital camera. The discharge was operated in atmospheric pressure air. When the voltage to the exposed electrode is increasing, streamers form and propagate away from the exposed electrode in tens of nanoseconds. When the voltage is decreasing, more diffuse microdischarges form in a few nanoseconds. The qualitative behaviors of the plasma agree well with two-dimensional fluid simulations. Expansion in the average length of microdischarges as the applied voltage changes in both half-cycles of the waveform is also observed.
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52.80.-s Electric discharges
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.65.-y Plasma simulation

Low-temperature sterilization of wrapped materials using flexible sheet-type dielectric barrier discharge

Hiroyuki Eto, Yoshihito Ono, Akihisa Ogino, and Masaaki Nagatsu

Appl. Phys. Lett. 93, 221502 (2008); http://dx.doi.org/10.1063/1.3039808 (3 pages) | Cited 15 times

Online Publication Date: 1 December 2008

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A flexible sheet-type dielectric barrier discharge (DBD) was studied for the low-temperature sterilization of medical instruments wrapped with Tyvek packaging. Sterilization experiments using Geobacillus stearothermophilus spores with a population of 106 were carried out with various mixtures of nitrogen and oxygen. We confirmed the inactivation of spores after 4.5 min of DBD irradiation at a temperature of 28.4 °C and relative humidity of 64.4%. The main sterilizing factors of this method are the ozone and UV emissions generated by DBD in dry air and synergistic OH radicals generated by DBD in moist air.
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87.85.Ox Biomedical instrumentation and transducers, including micro-electro-mechanical systems (MEMS)
52.80.-s Electric discharges
07.20.Mc Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment

Optimization of the size ratio of Sn sphere and laser focal spot for an extreme ultraviolet light source

S. Yuspeh, K. L. Sequoia, Y. Tao, M. S. Tillack, R. Burdt, and F. Najmabadi

Appl. Phys. Lett. 93, 221503 (2008); http://dx.doi.org/10.1063/1.3036956 (3 pages) | Cited 7 times

Online Publication Date: 3 December 2008

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The effect of the ratio of Sn sphere diameter to laser focal spot size (SD/FSS) on conversion efficiency (CE) from laser to in-band (2%) 13.5 nm extreme ultraviolet (EUV) light was investigated by fixing the laser spot size and irradiating variable diameter spheres. It was found that a minimum SD/FSS, i.e., 2.5, is necessary to produce high in-band CE, which is 15% higher than planar targets. Two-dimensional plasma density profile maps showed that the density of the dominant in-band EUV emission region and the size of the surrounding absorbing plasma can be manipulated by geometric effects of the SD/FSS ratio.
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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

Strongly confined plasmonic wave propagation through an ultrawideband staggered double grating waveguide

Young-Min Shin, Larry R. Barnett, and Neville C. Luhmann, Jr.

Appl. Phys. Lett. 93, 221504 (2008); http://dx.doi.org/10.1063/1.3041646 (3 pages) | Cited 7 times

Online Publication Date: 3 December 2008

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In the course of research on high power terahertz vacuum electronic radiation sources, it was discovered that an intense plasmonic wave propagates through the channel between a half-period-staggered pair of TE-mode gratings. Experimental measurements were in good agreement with both a theoretical model and simulation analysis within 2% over the passband. This phase-shifted geometric modulation supports a dynamic bandwidth exceeding 25% with signal attenuation of less than 0.15 dB/cm (at Ka-band). Finite-difference time-domain analysis revealed that this low dispersion and low-loss optical response is ascribed to point-contact hopping motion of widespread resonant waveguide modes with the same phase velocity.
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42.79.Gn Optical waveguides and couplers
41.20.Jb Electromagnetic wave propagation; radiowave propagation
02.70.Bf Finite-difference methods
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
78.68.+m Optical properties of surfaces

Atmospheric-pressure gas breakdown from 2 to 100 MHz

J. L. Walsh, Y. T. Zhang, F. Iza, and M. G. Kong

Appl. Phys. Lett. 93, 221505 (2008); http://dx.doi.org/10.1063/1.3043449 (3 pages) | Cited 23 times

Online Publication Date: 5 December 2008

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We report a detailed study of breakdown voltage of atmospheric-pressure helium gas between two parallel-plate electrodes from 2 to 100 MHz. Experimental data show that the breakdown voltage reduces initially with increasing frequency due to a diminishing contribution of drift-dominated electron wall loss and then begins to increase with increasing frequency. The latter is contrary to the current understanding that relies largely on the electron wall loss mechanism. Particle-in-cell simulation suggests that rapid oscillation of the applied voltage prevents electrons from reaching their maximum achievable kinetic energy, thus compromising the ionization efficiency and increasing the breakdown voltage.
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52.80.Pi High-frequency and RF discharges
52.80.Hc Glow; corona
52.40.Hf Plasma-material interactions; boundary layer effects
52.25.Fi Transport properties
52.65.Rr Particle-in-cell method
52.35.Fp Electrostatic waves and oscillations (e.g., ion-acoustic waves)

Driving frequency effects on the characteristics of atmospheric pressure capacitive helium discharge

Se Youn Moon, D. B. Kim, B. Gweon, and W. Choe

Appl. Phys. Lett. 93, 221506 (2008); http://dx.doi.org/10.1063/1.3043451 (3 pages) | Cited 11 times

Online Publication Date: 5 December 2008

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Atmospheric pressure helium discharge characteristics were investigated for varying driving radio frequencies in the range between 1.86 and 27.1 MHz. As the driving frequency is raised, both gas breakdown and α-γ transition voltages decrease due to the reduction in the electron drift loss. In addition, different discharge features such as normal, abnormal, α, and γ modes show certain dependences on the frequency. Using a simple circuit model, the changes in sheath thickness from 2.35 to 0.11 mm, electron density from 0.26 to 15.6×1011 cm−3 was obtained by raising the frequency from 1.86 to 27.1 MHz.
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52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.77.Fv High-pressure, high-current plasmas (plasma spray, arc welding, etc.)
52.80.Pi High-frequency and RF discharges
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