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5 Jan 2009

Volume 94, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 94, 013102 (2009); http://dx.doi.org/10.1063/1.3062938 (3 pages)

Hao-Chih Yuan, Jonghyun Shin, Guoxuan Qin, Lei Sun, Pallab Bhattacharya, Max G. Lagally, George K. Celler, and Zhenqiang Ma
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Self-pulsing 104 A cm−2 current density discharges in dielectric barrier Al/Al2O3 microplasma devices

D. Yarmolich, Ya. E. Krasik, E. Stambulchik, V. Bernshtam, J. K. Yoon, B. Herrera, S.-J. Park, and J. G. Eden

Appl. Phys. Lett. 94, 011501 (2009); http://dx.doi.org/10.1063/1.3064159 (3 pages) | Cited 5 times

Online Publication Date: 6 January 2009

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Excitation of Al/Al2O3 microplasma devices with 50 μs, 800 V pulses produces, in Ar/H2 gas mixtures at 600 Torr, ∼ 6 A current pulses with a duration of ∼ 30 ns. Corresponding to peak current and power densities of ∼ 104 A/cm2 and ∼ 2.5 GW/cm3, respectively, these pulses are generated in a 10 μs burst in which the voltage self-pulses at a repetition frequency of ∼ 3 MHz. Analysis of the Hα, Hβ, and Ar II emission line profiles yields a plasma density of ∼ 1017 cm−3, and the emission of O IV ions suggests the presence of energetic electrons. Images of the microplasma indicate that the plasma is initiated by surface flashover and extends ∼ 200 μm outside the microcavity.
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52.80.-s Electric discharges
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.75.-d Plasma devices

Practical implementation of a two-hemisphere plasma absorption probe

Christian Scharwitz, Marc Böke, Jörg Winter, Martin Lapke, Thomas Mussenbrock, and Ralf Peter Brinkmann

Appl. Phys. Lett. 94, 011502 (2009); http://dx.doi.org/10.1063/1.3055609 (3 pages) | Cited 5 times

Online Publication Date: 7 January 2009

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The plasma absorption probe is a recently developed tool for efficient determination of electron densities of low temperature plasmas. The occurrence of multiple absorption signals was a serious drawback for interpretation of the probe data. To remedy this drawback, a spherically symmetric design of an absorption probe is proposed. A spherical probe is tested in experiment and simulation and the suppression of the multiple absorption signals is demonstrated. The proof of principle for the concept is given.
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52.70.Ds Electric and magnetic measurements

Control of cavity cross section in microplasma devices: Luminance and temporal response of 200×100 and 320×160 arrays with parabolic Al2O3 microcavities

K. S. Kim, T. L. Kim, J. K. Yoon, S.-J. Park, and J. G. Eden

Appl. Phys. Lett. 94, 011503 (2009); http://dx.doi.org/10.1063/1.3043685 (3 pages) | Cited 6 times

Online Publication Date: 9 January 2009

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Intense green luminance and luminous efficacies approaching 4 lm/W have been observed for large (50×50 to 320×160) arrays of microplasma devices with parabolic cross-sectional Al2O3 microcavities and conformal aluminum electrodes, operating in Ne/Xe gas mixtures. Precise control of the cross-sectional geometry and surface morphology of the cavities within Al/Al2O3 microplasma devices having a dielectric barrier structure has been achieved with a sequence of wet electrochemical processes. Continuous variation of the cavity cross section between a linear taper and parabolic geometry can be specified and all dimensions controlled to within ±2%. Aluminum electrodes encompassing each cavity are azimuthally symmetric and the inner face of each electrode is conformal to the Al2O3 microcavity wall. Arrays comprising 20 000 devices (in a 200×100 configuration) with a parabolic microcavity wall profile and an emitting aperture 160±2 μm in diameter produce a green luminance >1800 cd/m2 and a peak luminous efficacy of 3.9 lm/W in Ne/30% Xe gas mixtures at a total pressure of 500 Torr. Temporal response measurements show the visible emission rise time of 200–250 ns to be limited only by the rise time of the voltage waveform itself.
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52.75.-d Plasma devices
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