THz polarization effects on detection responsivity of glow discharge detectors (GDDs)

A. Abramovich, N. S. Kopeika, D. Rozban

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

The detection mechanism of glow discharge plasma in neon indicator lamps has been investigated in the terahertz and microwave spectral regions. The influence of the THz radiation polarization on the responsivity of glow discharge detectors (GDD) is considered here. There are two detection mechanisms in the GDD that exist simultaneously, each at the expense of the other. Experiments with GDD neon indicator lamps in the THz regime prove that the dominant detection mechanism of the GDD is enhanced cascade ionization rather than enhanced diffusion current. Our polarization experiments in the THz regime show that when the electric field of the THz radiation is in the same direction as the DC bias electric field of the lamp, the responsivity is about 50% higher than when the THz electric field is orthogonal to the DC field. This supports the concept that the dominant detection mechanism of the GDD in the THz regime is enhanced cascade ionization.

Original languageEnglish
Article number5210231
Pages (from-to)1181-1184
Number of pages4
JournalIEEE Sensors Journal
Volume9
Issue number10
DOIs
StatePublished - 1 Oct 2009

Keywords

  • Glow discharge
  • Plasma
  • Polarization
  • THz detector
  • THz imaging

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