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20 Aug 2007

Volume 91, Issue 8, Articles (08xxxx)

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Appl. Phys. Lett. 91, 083504 (2007); http://dx.doi.org/10.1063/1.2772752 (3 pages)

Jeong-M. Choi, Jae Hoon Kim, and Seongil Im
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Spatial confinement effects in laser-induced breakdown spectroscopy

X. K. Shen, J. Sun, H. Ling, and Y. F. Lu

Appl. Phys. Lett. 91, 081501 (2007); http://dx.doi.org/10.1063/1.2770772 (3 pages) | Cited 9 times

Online Publication Date: 20 August 2007

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The spatial confinement effects in laser-induced breakdown of aluminum (Al) targets in air have been investigated both by optical emission spectroscopy and fast photography. A KrF excimer laser was used to produce plasmas from Al targets in air. Al atomic emission lines show an obvious enhancement in the emission intensity when a pair of Al-plate walls were placed to spatially confine the plasma plumes. Images of the Al plasma plumes showed that the plasma plumes evolved into a torus shape and were compressed in the Al walls. The mechanism for the confinement effects was discussed using shock wave theory.
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61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
82.50.-m Photochemistry
52.38.Mf Laser ablation
52.35.Tc Shock waves and discontinuities

Production of high-current heavy ion jets at the short-wavelength subnanosecond laser-solid interaction

J. Badziak, A. Kasperczuk, P. Parys, T. Pisarczyk, M. Rosiński, L. Ryć, J. Wołowski, S. Jabłoński, R. Suchańska, E. Krousky, L. Láska, K. Mašek, M. Pfeifer, J. Ullschmied, L. J. Dareshwar, et al.

Appl. Phys. Lett. 91, 081502 (2007); http://dx.doi.org/10.1063/1.2771378 (3 pages) | Cited 4 times

Online Publication Date: 20 August 2007

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Generation of ion fluxes at the interaction of 70 J, 0.438 μm subnanosecond laser pulse with a massive planar target has been investigated. It is shown that after proper optimization of high-Z (Cu or Ta) target irradiation, a highly collimated heavy ion jet of the ion current >100 A and the ion current density >1 A/cm2 at 1 m from the target can be produced with an energy conversion efficiency nearly 10%.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.25.Fi Transport properties
52.38.Ph X-ray, γ-ray, and particle generation

Enhanced microwave transmission through quasicrystal hole arrays

N. Papasimakis, V. A. Fedotov, A. S. Schwanecke, N. I. Zheludev, and F. J. García de Abajo

Appl. Phys. Lett. 91, 081503 (2007); http://dx.doi.org/10.1063/1.2773763 (3 pages) | Cited 14 times

Online Publication Date: 23 August 2007

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The authors report on the observation of enhanced microwave transmission through quasiperiodic hole arrays in metal films. The fraction of transmitted light reaches 50% in a self-standing metal film and approaches 90% when the film is sandwiched between thin dielectric slabs, while the holes occupy only 10% of the sample area. The maximum transmission exhibits a Breit-Wigner resonance behavior, accompanied by zero phase change and rendering the film almost invisible over a wide frequency range. The extraordinary transmission phenomenon is interpreted in terms of resonances in the self-consistent interaction between holes, which are represented by effective electric and magnetic dipoles.
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78.66.Bz Metals and metallic alloys
61.44.Br Quasicrystals
68.55.-a Thin film structure and morphology

Impedance matching for an asymmetric dielectric barrier discharge plasma actuator

Kunwar Pal Singh and Subrata Roy

Appl. Phys. Lett. 91, 081504 (2007); http://dx.doi.org/10.1063/1.2773932 (3 pages) | Cited 6 times

Online Publication Date: 23 August 2007

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A typical dielectric barrier discharge plasma actuator requires a power supply capable of delivering power at a frequency range of several kilohertz and a rms voltage up to 20 kV. An impedance mismatch resulting from the absence of a matching network causes a large reflected power from the plasma actuator back to the power supply. This does not contribute to plasma formation and requires an expensive over-rated power supply. The authors suggest an impedance matching network for a realistic asymmetric dielectric barrier discharge plasma actuator with a virtual electrode.
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52.75.-d Plasma devices
52.80.-s Electric discharges

Additional focusing of a high-intensity laser beam in a plasma with a density ramp and a magnetic field

Devki Nandan Gupta, Min Sup Hur, and Hyyong Suk

Appl. Phys. Lett. 91, 081505 (2007); http://dx.doi.org/10.1063/1.2773943 (3 pages) | Cited 6 times

Online Publication Date: 23 August 2007

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Propagation of a high power Gaussian laser beam through a plasma with a density ramp where a magnetic field is present has been investigated. The spot size of the laser beam decreases as the beam penetrates into the plasma due to the role of a plasma density ramp. The studies show that the combined effect of a plasma density ramp and a magnetic field enhances the self-focusing property of the laser beam. Both factors not only reduce the spot size of the laser beam but also maintain it with only a mild ripple over several Rayleight lengths.
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52.38.Hb Self-focussing, channeling, and filamentation in plasmas
52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.)
42.60.Jf Beam characteristics: profile, intensity, and power; spatial pattern formation
52.25.Xz Magnetized plasmas

Angle-resolved absolute out-of-band radiation studies of a tin-based laser-produced plasma source

O. Morris, P. Hayden, F. O’Reilly, N. Murphy, P. Dunne, and V. Bakshi

Appl. Phys. Lett. 91, 081506 (2007); http://dx.doi.org/10.1063/1.2769940 (3 pages) | Cited 13 times

Online Publication Date: 24 August 2007

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Out-of-band radiation emitted from an extreme ultraviolet laser-produced plasma, formed on a solid tin target, was measured over several angles between 25° and 85° with respect to the target normal for six energy bands between 200 and 1000 nm. The optical and target system was rotated with respect to the detector and the intensity of the radiation was measured using an absolutely calibrated filter/photodiode combination. The emission was dominated by radiation in the 214 nm band. A cosine function fitted to the angular distribution of the total radiation yielded an exponent of 0.23±0.02.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.50.Dg Plasma sources
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
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