Argon Medical Devices Germany

The Role of Spectral-Domain OCT in the Diagnosis and Management of

Headline Investigation of Plasma Dynamics in Micro-Scaled Atmospheric Pressure Arrays

There is a growing interest in micro-scaled atmospheric pressure discharges structured in arrays of up to maximum of Thousands of single devices. They offer to immense application potential in the biological and medical as well as in the optoelectronic sector. Operated with rare gases It serves as a UV light source Which can eg be used for sterilization and biological deactivation and decontamination. More over, searching arrays can, due to Their higher sensitivity, Efficiently replace avalanche diodes for photon detection. Another potential application is the generation of Radicals Which can eg be used to modify surface properties. HOWEVER, plasma dynamics in seeking devices are only rudimentary be understood. Due to the small dimensions and high pressure experimental investigations are challenging.

Plasma arrays developed by JG Eden (UIUC) et al. will be exemplarily Investigated using phase and space resolved diagnostics. Through synthesis investigations Especially insight into ignition and sustaining mechanisms of both the individual discharge and the array as a whole wants to be Obtained.

Preliminary investigations on an AC-driven micro-scaled atmospheric pressure array using phase-resolved optical emission spectroscopy (PROES) Showed did emission is neither continuous nor Localised over the excitation cycle to specific single discharges. Cross-talk between individual devices leads to wave-like phenomena thathave yet to be be understood. Further More, self-pulsing thing Observed operating with the triangular array voltage.

Further detailed examination of different arrays with varying gaps between single pixels, pixel sizes as well as number of total pixels will yield deeper insight into the mechanisms named. To support the experimental investigations a collaboration with the group of RP Brinkmann (RUB) is Planned. Due to the small dimensions of the Observed discharge, particle-in-cell (PIC) simulations are suitable to compute particle and excitation dynamics. The comparison of computed and Measured data will yield valuable information on ignition and sustaining mechanisms in the micro-plasma array.

Further in the course of this project it is Planned to investigate similar atmospheric pressure micro-plasma arrays with cylindrical cavities. By doing so the influence of the discharge geometry on ignition and sustaining mechanisms as well as cross-talk and propagation of waves can be verified.

Ionization wave propagation on a micro cavity plasma array
A. Wollny, T. Hemke, M. Gebhardt, RP Brinkmann, H. Boettner, J. Winter, V. Schulz-von der Gathen, Z. Xiong, MJ Kushner, and T. Mussenbrock
Appl. Phys. Lett. 99 (2011) 141504

Excitation dynamics of a kHz driven micro-structured plasma channel device operated in argon
A. Greb, H. Boettner, J. Winter and V. Schulz-von der Gathen
Plasma Sources Sci. Technol. 20 (2011) 055010

Phase resolved optical emission spectroscopy of coaxial microplasma jet operated with He and Ar
J. Benedict, S. Hofmann, N. Knake, H. Boettner, R. Reuter, A. von Keudell, and V. Schulz-von der Gathen
Eur Phys. J. D 60 (2010) 539

Excitation dynamics of micro-structured atmospheric pressure plasma arrays
H. Boettner, J. Waskönig, D. O'Connell, TL Kim, PA Tchertchian, J. Winter, and V. Schulz-von der Gathen
J. Phys. D: Appl. Phys. 43 (2010) 124010

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