Abstract
The appearance of resonant structures in metamaterials coupled to plasmas motivates the systematic investigation of gas breakdown and plasma impedance in split-ring resonators over a frequency range of 0.5−9 GHz. In co-planar electrode gaps of 100 μm, the breakdown voltage amplitude decreases from 280 V to 225 V over this frequency range in atmospheric argon. At the highest frequency, a microplasma can be sustained using only 2 mW of power. At 20 mW, we measure a central electron density of 2 × 1020 m-3. The plasma-electrode overlap plays a key role in the microplasma impedance and causes the sheath impedance to dominate the plasma resistance at very low power levels.
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Hoskinson, A., Parsons, S. & Hopwood, J. Gas breakdown and plasma impedance in split-ring resonators. Eur. Phys. J. D 70, 30 (2016). https://doi.org/10.1140/epjd/e2016-60445-x
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DOI: https://doi.org/10.1140/epjd/e2016-60445-x