Reflection and retrodirection effects in the presence of cylinders and corrugated surfaces: Theory – abstract

Dan Censor, Martin D. Fox, Jonathan Molcho

Research output: Contribution to journalArticlepeer-review

Abstract

A mirroring mechanism, dubbed retrodirection (as opposed to (simple) reflection) was recently introduced in connection with po-larimetric measurements in chiral or in gyrotropic media [1]. It has been shown that a specular return from a number of mirrors, com- bined with the nature of the individual mirrors (being individually reflectors or retrodirectors), and the materials involved, determines the overall systemic properties for the returned electromagnetic waves, i.e., whether polarimetric effects are enhanced or canceled. The present study focuses on the relevant properties of corrugated and cylinder lined surfaces. An exact analytic solution for these geometries is not available, hence two strategies are employed here for relevant limiting cases: For large (compared to wavelength) cylinder radii or large corru-gation steps, a specular model is used. Single specular scattering then leads to (simple) reflection, while multiple scattering by two cylinders yields retrodirection. The two modes can be created simultaneously, which raises the question of filtering any of them out, as discussed below. For thin cylinders the single circular cylinder as a canonical problem is investigated. The analysis shows that a highly conductive, single, thin cylinder will act as a retrodirective element. This property is lost when the cylinder is dielectric, moderately contrasted with respect to the embedding medium, or when the cylinder radius is large. Some of the presently invoked approximations are somewhat specula-tive. We report here the theoretical arguments, and intend to publish experimental data in a future paper.

Original languageEnglish
Pages (from-to)889-891
Number of pages3
JournalJournal of Electromagnetic Waves and Applications
Volume13
Issue number7
DOIs
StatePublished - 1 Jan 1999

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Physics and Astronomy (all)
  • Electrical and Electronic Engineering

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