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Electron number density measurements from the frequency shift of a plasma defect state in a one-dimensional photonic crystal

  • David Z. PaiEmail author
  • Fabio Righetti
  • Benjamin C. Wang
  • David R. Biggs
  • Mark A. CappelliEmail author
Regular Article
  • 17 Downloads

Abstract

We describe the use of a plasma-functionalized vacancy defect in a one-dimensional microwave photonic crystal to experimentally measure the electron number density of glow discharges at 5–40 torr. The photonic crystal consists of spaced alumina plates with a built-in void defect that breaks the repeating symmetry of the layers, resulting in narrow defect transmission peaks within relatively deep bandgaps. We exploit the sensitivity of the defect transmission at 28 GHz to varying plasma density to measure electron number densities as low as 2 × 109 cm−3. Defect energy shifts are proportional to plasma density, in reasonable agreement with theoretical predictions of photonic crystal performance. At higher discharge current densities and discharge pressure, we see a departure from the model predictions, largely attributable to the heating of the alumina structure, causing expansion and changes in the lattice parameter that counteract the effect of the increased plasma density on the defect state frequency.

Graphical abstract

Keywords

Plasma Physics 

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Copyright information

© EDP Sciences / Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Institut Pprime (CNRS UPR 3346–Université de Poitiers–ENSMA)Chasseneuil FuturoscopeFrance
  2. 2.Stanford Plasma Physics Laboratory, Department of Mechanical Engineering, Stanford UniversityStanfordUSA

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