Abstract
Arrays of dielectric resonators—illuminated by an antenna— are used to ignite and sustain multiple microwave plasmas in parallel. Cylindrical resonators of calcium titanate were arranged in a linear array with separation distances between 0.5 and 5 mm. The operating frequency was near the HEM111 resonance 1 of 1.1 GHz. Sustaining of argon plasma between 0.5 Torr and 1 atm within the array is found to alter the electromagnetic scattering from the dielectric resonators 2, suggesting applications in plasma-reconfigurable metamaterials and photonic crystals. A relationship was discovered between permittivity and the strength of the coupled electric field. Experimentally, breakdown did not occur for dielectric resonators with low ( 800) relative permittivity. Field simulations show a broad maximum in the microwave field generated on the external boundary of the resonators, peaking around $\varepsilon _{r} \sim 200.$ Calcium titanate is a material in the optimal range for gas breakdown.
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