Spatial dynamics of the light emission from a microplasma array

Waskoenig, Jochen; O’Connell, Deborah; Gathen, Volker Schulz-von der; Winter, J.; Park, S. J.; Eden, J. G.

doi:10.1063/1.2894227

Cited by 39 publications

(44 citation statements)

References 23 publications

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“…However, as the amplitude of the applied voltage continues to increase, it is possible for a subsequent discharge to form during the same half-cycle. Here, the required increase in the strength of the electric field can depend upon the presence of helium metastables that are present following the previous activation [55]. Similar behavior has previously been observed in kilohertz-driven atmospheric-pressure barrier discharges [56,57].…”

Section: Characterization Of the Optical Emissionsupporting

confidence: 53%

“…To obtain the image sequence, the ICCD was gated with respect to the applied voltage For pressures of 500 and 760 Torr, shown in Figures 4A,B, respectively, the discharge is observed to ignite in two bursts per voltage cycle with one burst of discharge activity per half-cycle. As described in previous imaging studies of microplasma arrays [54,55], within each half-cycle of the applied voltage (50 µs duration) the plasma activates in a series of pulses, the first of which exhibits the largest optical-emission intensity and occurs when the electric field between the electrodes becomes sufficiently large to generate an electron avalanche and Townsend discharge. For both pressure cases, following the first activation in each half-cycle the plasma extinguishes when the accumulation of surface charge on the dielectric causes a sufficient reduction of the electric field.…”

Section: Characterization Of the Optical Emissionmentioning

confidence: 99%

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Microplasma Array Patterning of Reactive Oxygen and Nitrogen Species onto Polystyrene

Szili

Dedrick

et al. 2017

Front. Phys.

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We investigate an approach for the patterning of reactive oxygen and nitrogen species (RONS) onto polystyrene using atmospheric-pressure microplasma arrays. The spectrally integrated and time-resolved optical emission from the array is characterized with respect to the applied voltage, applied-voltage frequency and pressure; and the array is used to achieve spatially resolved modification of polystyrene at three pressures: 500, 760, and 1000 Torr. As determined by time-of-flight secondary ion mass spectrometry (ToF-SIMS), regions over which surface modification occurs are clearly restricted to areas that are exposed to individual microplasma cavities. Analysis of the negative-ion ToF-SIMS mass spectra from the center of the modified microspots shows that the level of oxidation is dependent on the operating pressure, and closely correlated with the spatial distribution of the optical emission. The functional groups that are generated by the microplasma array on the polystyrene surface are shown to readily participate in an oxidative reaction in phosphate buffered saline solution (pH 7.4). Patterns of oxidized and chemically reactive functionalities could potentially be applied to the future development of biomaterial surfaces, where spatial control over biomolecule or cell function is needed.

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Section: Characterization Of the Optical Emissionsupporting

confidence: 53%

Section: Characterization Of the Optical Emissionmentioning

confidence: 99%

Microplasma Array Patterning of Reactive Oxygen and Nitrogen Species onto Polystyrene

Szili

Dedrick

et al. 2017

Front. Phys.

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“…The general time-dependent behaviour of the investigated microplasma arrays has already been described by Waskoenig et al [18]. The spectrally integrated emission Normalised integrated emission intensity of the whole microplasma array as well as the latter normalised to the driving frequency.…”

Section: Ac Excitation and Self-pulsingmentioning

confidence: 99%

Excitation dynamics of micro-structured atmospheric pressure plasma arrays

Boettner¹,

Waskoenig²,

O’Connell³

et al. 2010

J. Phys. D: Appl. Phys.

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Abstract. The spatial dynamics of the optical emission from an array of 50 times 50 individual micro cavity plasma devices are investigated. The array is operated in argon and argon-neon mixtures close to atmospheric pressure with an AC voltage. The optical emission is analysed with phase and space resolution. It has been found that the emission is not continuous over the entire AC period, but occurs once per half period. Each of the observed emission phases shows a self-pulsing of the discharge, with several bursts of emission of fixed width and repetition rate. The number of emission bursts depends on applied voltage and frequency. Spatially resolved measurements prove that the emission bursts are formed by overlapping emission pulses from single discharge cavities. Intensity differences between positive and negative half-wave can be interpreted through spatially resolved measurements of single discharge cavities.

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“…This technique uses a fast intensified charge-coupled device (ICCD) camera with a high repetition rate of several MHz, collecting information over each RF cycle [40][41][42][43][44]. The emission is spectrally separated using an interference filter with a central wavelength of 750 nm and a FWHM of 10 nm.…”

Section: Benchmark Via Proesmentioning

confidence: 99%

Diagnostic-based modeling on a micro-scale atmospheric-pressure plasma jet

Waskoenig

Niemi

Knake

et al. 2010

Pure and Applied Chemistry

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Diagnostic-based modeling (DBM) actively combines complementary advantages of numerical plasma simulations and relatively simple optical emission spectroscopy (OES). DBM is applied to determine spatial absolute atomic oxygen ground-state density profiles in a micro atmospheric-pressure plasma jet operated in He-O 2 . A 1D fluid model with semi-kinetic treatment of the electrons yields detailed information on the electron dynamics and the corresponding spatio-temporal electron energy distribution function. Benchmarking this time-and space-resolved simulation with phase-resolved OES (PROES) allows subsequent derivation of effective excitation rates as the basis for DBM. The population dynamics of the upper O(3p 3 P) oxygen state (λ = 844 nm) is governed by direct electron impact excitation, dissociative excitation, radiation losses, and collisional induced quenching. Absolute values for atomic oxygen densities are obtained through tracer comparison with the upper Ar(2p 1 ) state (λ = 750.4 nm). The resulting spatial profile for the absolute atomic oxygen density shows an excellent quantitative agreement to a density profile obtained by two-photon absorption laser-induced fluorescence spectroscopy.

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Spatial dynamics of the light emission from a microplasma array

Cited by 39 publications

References 23 publications

Microplasma Array Patterning of Reactive Oxygen and Nitrogen Species onto Polystyrene

Microplasma Array Patterning of Reactive Oxygen and Nitrogen Species onto Polystyrene

Excitation dynamics of micro-structured atmospheric pressure plasma arrays

Diagnostic-based modeling on a micro-scale atmospheric-pressure plasma jet

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