Journal
IEEE TRANSACTIONS ON PLASMA SCIENCE
Volume 31, Issue 4, Pages 782-787Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPS.2003.815470
Keywords
low-power microplasma; microwave plasma; split-ring resonator
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Microplasma sources can, be integrated into portable devices for applications such as bio-microelectromechanical system sterilization, small-scale materials processing, and microchemical analysis systems. Portable operation, however, limits the amount of power and vacuum levels that can be employed in the plasma source. This paper describes the design and initial characterization of a low-power microwave plasma source based on a microstrip split-ring resonator that is capable of operating at pressures from 0.05 torr (6.7 Pa) up to one atmosphere. The plasma source's microstrip resonator operates at 900 MHz and presents a quality factor of Q = 335. Argon and air discharges can be self-started with less than 3 W in a relatively wide pressure range. An ion density of 1.3 x 10(11) cm(-3) in argon at 400 mtorr (53.3 Pa) can be created using only 0.5 W. Atmospheric discharges can be sustained with 0.5 W in argon. This low power allows for portable air-cooled operation. Continuous operation at atmospheric pressure for 24 h in argon at 1 W shows no measurable damage to the source.
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