Polarisation conversion at a textured surface

Author

Lawrence, C.R. ; Treen, A.S.

Author_Institution

Defence Eval. Res. Agency, Farnborough, UK

Volume

146

Issue

4

fYear

1999

fDate

8/1/1999 12:00:00 AM

Firstpage

241

Lastpage

246

Abstract

It has previously been shown that the electric vector of visible-wavelength radiation can be rotated through 90° by reflecting photons from a suitably aligned diffraction grating. The phenomenon has now been directly extended to the microwave regime, and the use of gratings exhibiting a finite number of grooves has been investigated. While efficient conversion has been obtained from gratings consisting of as few as five grooves, the wavelength dependence of the effect is not in good agreement with an unmodified optical model of the system. Several possible explanations were investigated, and it was deduced that the main error was due to the nonplanar wavefronts produced by the source. An experimental solution to this problem is suggested

Keywords

diffraction gratings; electromagnetic wave polarisation; electromagnetic wave reflection; microwave materials; surface texture; diffraction grating; efficient conversion; electric vector; experimental solution; grooves; microwave frequencies; nonplanar wavefronts; polarisation conversion; reflecting photons; textured surface; unmodified optical model; visible-wavelength radiation; wavelength dependence;

fLanguage

English

Journal_Title

Microwaves, Antennas and Propagation, IEE Proceedings

Publisher

iet

ISSN

1350-2417

Type

jour

DOI

10.1049/ip-map:19990599

Filename

799048