Plasma reconfigurable metamaterial using a 6.5 GHz dielectric resonator array

Lisa Fantini, Stephen Dennison, Hyunjun Kim, Maryam Sarkarat, Michael Lanagan, Jeffrey Hopwood

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Plasma formation between coupled dielectric resonators (DRs) is frequency scaled from 1 GHz to 7 GHz. Previous research found that applying low-power microwaves to a pair of calcium titanate (CaTiO3) resonators could ignite plasma between them using the HEM111 resonance mode. Those large, 1 GHz DRs are scaled down in size, and thus scaled up in frequency. The optimum relative permittivity of DRs for plasma formation is reported to be 200, confirming that CaTiO3r ∼170 ± 5) is a good material to use for plasma-forming DRs. This paper presents data collected for a 2D array of resonators operating in the 6-7 GHz range for separation distances of 0.25 mm and 0.5 mm in a 1-10 Torr argon gas environment. Gas breakdown data for two DR configurations are compared to the Raizer theory at 1.1 GHz and 6.5 GHz. Plasma modulation of the reflection and transmission of DR arrays with plasma on and off indicates possible future applications as a frequency selective filter.

Original languageEnglish (US)
Article number203301
JournalJournal of Applied Physics
Volume126
Issue number20
DOIs
StatePublished - Nov 28 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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