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Title: Rotation and dichroism associated with microwave propagation in chiral composite samples

Abstract

Experimental results are presented on the angle of rotation and the axial ratio (dichroism) associated with the propagation of microwave waves in chiral composite samples (a phenomenon akin to optical rotation and optical dichroism). In the experiments the chiral composite samples tested were made in the form of planar slabs and consisted of low loss dielectric matrix materials in which miniature copper springs of left only, right only, or an equal mixture of left and right handedness were randomly distributed and oriented. The normally incident wave was linearly polarized. In the chiral sample the linearly polarized wave decomposes into left and right circularly polarized waves which propagate with different speeds and different attenuations leading to an elliptically polarized transmitted wave whose orientation (electromagnetic rotation) and axial ratio (dichroism) are proportional to the concentration of springs. Rotation and dichroism are shown to be zero in the equichiral samples. 10 refs.

Authors:
; ;  [1]
  1. Pennsylvania State University, University Park (USA)
Publication Date:
OSTI Identifier:
5830035
Resource Type:
Journal Article
Journal Name:
Radio Science; (United States)
Additional Journal Information:
Journal Volume: 26; Other Information: RASCA; Journal ID: ISSN 0048-6604
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; DICHROISM; COPPER; DIELECTRIC MATERIALS; EPOXIDES; MICROWAVE RADIATION; PHYSICAL PROPERTIES; POLARIZATION; ROTATION; TRANSMISSION; WAVE PROPAGATION; ELECTROMAGNETIC RADIATION; ELEMENTS; MATERIALS; METALS; MOTION; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; RADIATIONS; TRANSITION ELEMENTS; 360606* - Other Materials- Physical Properties- (1992-)

Citation Formats

Umari, M H, Varadan, V V, and Varadan, V K. Rotation and dichroism associated with microwave propagation in chiral composite samples. United States: N. p., 1991. Web. doi:10.1029/91RS01370.
Umari, M H, Varadan, V V, & Varadan, V K. Rotation and dichroism associated with microwave propagation in chiral composite samples. United States. doi:10.1029/91RS01370.
Umari, M H, Varadan, V V, and Varadan, V K. Tue . "Rotation and dichroism associated with microwave propagation in chiral composite samples". United States. doi:10.1029/91RS01370.
@article{osti_5830035,
title = {Rotation and dichroism associated with microwave propagation in chiral composite samples},
author = {Umari, M H and Varadan, V V and Varadan, V K},
abstractNote = {Experimental results are presented on the angle of rotation and the axial ratio (dichroism) associated with the propagation of microwave waves in chiral composite samples (a phenomenon akin to optical rotation and optical dichroism). In the experiments the chiral composite samples tested were made in the form of planar slabs and consisted of low loss dielectric matrix materials in which miniature copper springs of left only, right only, or an equal mixture of left and right handedness were randomly distributed and oriented. The normally incident wave was linearly polarized. In the chiral sample the linearly polarized wave decomposes into left and right circularly polarized waves which propagate with different speeds and different attenuations leading to an elliptically polarized transmitted wave whose orientation (electromagnetic rotation) and axial ratio (dichroism) are proportional to the concentration of springs. Rotation and dichroism are shown to be zero in the equichiral samples. 10 refs.},
doi = {10.1029/91RS01370},
journal = {Radio Science; (United States)},
issn = {0048-6604},
number = ,
volume = 26,
place = {United States},
year = {1991},
month = {10}
}