Experimental and numerical study of electromagnetic wave trapping in a time-varying periodic plasma

James Faith, Joe Huang, S. P. Kuo

Research output: Contribution to journalConference articlepeer-review

Abstract

A way to achieve more efficient interaction in electromagnetic wave trapping is to use a periodic plasma several free space wavelengths long to trap the incident electromagnetic wave. Considering such a structure, as the plasma density grows from zero, the incident wave initially sees a small plasma-free space discontinuity. This provides for a large transmission (and small reflection) coefficient into (from) the structure. In the time it takes the wave propagates to the far end of the structure the plasma continues to grow. Therefore, at the boundary between the final plasma layer and free space, the plasma density has increased and the reflection coefficient at this boundary is greater than the one encountered at the beginning of the structure. Thus some of the wave energy is trapped within the structure, where it can effectively interact with the plasma, and alter its spectral content. The trapping process is expected to be more effective for the down-shifted Floquet modes. An experiment exhibiting these phenomena confirms that the amplitude of frequency altered pulses is vastly enhanced over the case of a single plasma slab. Experimental results, along with related numerical simulations, showing the large down-shifted lines are presented.

Original languageEnglish (US)
Number of pages1
JournalIEEE International Conference on Plasma Science
StatePublished - 1996
EventProceedings of the 1996 IEEE International Conference on Plasma Science - Boston, MA, USA
Duration: Jun 3 1996Jun 5 1996

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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