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15 Jan 2007

Volume 90, Issue 3, Articles (03xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 90, 032108 (2007); http://dx.doi.org/10.1063/1.2431702 (3 pages)

D. Buca, B. Holländer, S. Feste, St. Lenk, H. Trinkaus, S. Mantl, R. Loo, and M. Caymax
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Singlet oxygen production in a microcathode sustained discharge

G. Bauville, B. Lacour, L. Magne, V. Puech, J. P. Boeuf, E. Munoz-Serrano, and L. C. Pitchford

Appl. Phys. Lett. 90, 031501 (2007); http://dx.doi.org/10.1063/1.2431791 (3 pages) | Cited 18 times

Online Publication Date: 16 January 2007

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The authors report experimental results showing that high yields of singlet oxygen O2(a 1Δg) can be generated in a three-electrode microcathode sustained discharge (MCSD) configuration. This configuration consists of a microhollow cathode discharge (MHCD) acting as a plasma cathode to sustain a stable glow discharge between the MHCD and a third, planar electrode placed at a distance of 8 mm. Experiments were performed in pure oxygen and in mixtures of oxygen with rare gases (He or Ar) at pressures up to 130 Torr. O2(a 1Δg) relative yields of 7.6% were measured 23 cm downstream in the afterglow of the MCSD discharge.
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52.80.Hc Glow; corona
52.50.Dg Plasma sources
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.25.Os Emission, absorption, and scattering of electromagnetic radiation

Superradiant terahertz Smith-Purcell radiation from surface plasmon excited by counterstreaming electron beams

Young-Min Shin, Jin-Kyu So, Kyu-Ha Jang, Jong-Hyo Won, Anurag Srivastava, and Gun-Sik Park

Appl. Phys. Lett. 90, 031502 (2007); http://dx.doi.org/10.1063/1.2432270 (3 pages) | Cited 19 times

Online Publication Date: 17 January 2007

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The authors show that evanescent tunneling transmission of effective surface plasmon polaritons between two counterstreaming electron beams noticeably increases Smith-Purcell radiation (SPR) intensity by about two orders of magnitude as well as lower its transition threshold from a spontaneous emission to a stimulated one. An emission mechanism of the superradiant SPR is theoretically analyzed by the dielectric conversion of the structured metal surface and the boundary matching condition of Maxwell’s equations in comparison with numerical simulations.
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42.50.Nn Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems
78.45.+h Stimulated emission
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
71.36.+c Polaritons (including photon-phonon and photon-magnon interactions)
78.68.+m Optical properties of surfaces

Influence of a large oblique incident angle on energetic protons accelerated from solid-density plasmas by ultraintense laser pulses

C. T. Zhou and X. T. He

Appl. Phys. Lett. 90, 031503 (2007); http://dx.doi.org/10.1063/1.2432242 (3 pages) | Cited 24 times

Online Publication Date: 18 January 2007

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The acceleration of energetic electron, proton, and heavy ion beams produced by ultrahigh-intensity laser pulses through thin plastic targets is studied using two-dimensional hybrid particle-in-cell simulation. When the laser is incident at a large angle, the proton beams accelerated from the front and rear surfaces of the target deviate from the normal direction because of the formation of non-Gaussian asymmetric sheath field at the target surfaces. In particular, the simulations clearly show that the proton beam in the backward direction can have higher Bragg peak energy than that of the forward direction if the incident angle is sufficiently large.
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52.38.Kd Laser-plasma acceleration of electrons and ions
52.40.Mj Particle beam interactions in plasmas
52.65.Rr Particle-in-cell method
52.65.Ww Hybrid methods
52.40.Kh Plasma sheaths

Hexagon and square patterned air discharges

Lifang Dong, Yafeng He, Weili Liu, Ruiling Gao, Hongfang Wang, and Haitao Zhao

Appl. Phys. Lett. 90, 031504 (2007); http://dx.doi.org/10.1063/1.2432950 (3 pages) | Cited 13 times

Online Publication Date: 19 January 2007

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Hexagon and square patterned air discharges are realized by using a dielectric barrier discharge device with two water electrodes. With increasing voltage, the filaments (plasma columns) tend to be dense and regularly arranged, and the current in each half cycle changes from several peaks to one leading peak followed by a broad hump of current peaks. It shows that the spatiotemporal correlation between filaments is enhanced with increasing voltage. A phase diagram of hexagon patterned air discharge with different gas gap widths as a function of air pressure and applied voltage is presented.
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52.80.-s Electric discharges
52.25.Fi Transport properties
05.45.-a Nonlinear dynamics and chaos

Mitigating plasma constriction using dielectric barriers in radio-frequency atmospheric pressure glow discharges

J. J. Shi, D. W. Liu, and M. G. Kong

Appl. Phys. Lett. 90, 031505 (2007); http://dx.doi.org/10.1063/1.2432233 (3 pages) | Cited 15 times

Online Publication Date: 19 January 2007

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It is known that radio-frequency (rf) atmospheric glow discharges with bare electrodes are susceptible to plasma constriction at large discharge currents. This is undesirable for large-scale applications, even though large currents usually lead to abundant plasma reactive species and high application efficiency. In this letter, an experimental investigation is presented to demonstrate that plasma constriction can be mitigated by introducing dielectric barriers to the electrodes. The resulting atmospheric rf dielectric-barrier discharge is shown to operate in the γ mode of large discharge current while maintaining its discharge volume. This improves significantly plasma stability and the application potential.
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52.80.Hc Glow; corona
52.80.Pi High-frequency and RF discharges
52.25.Fi Transport properties
52.35.Qz Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.)
52.25.Mq Dielectric properties
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