Experimental study of chiral composites

Ru-Yen Ro; Vasundara V. Varadan; Vijay K. Varadan

doi:10.1117/12.49633

11 November 1991 Experimental study of chiral composites

Ru-Yen Ro, Vasundara V. Varadan, Vijay K. Varadan

Proceedings Volume 1558, Wave Propagation and Scattering in Varied Media II; (1991) https://doi.org/10.1117/12.49633
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

Reflection and transmission characteristics of chiral composites are obtained for a normally incident, linearly polarized plane wave by employing a free-space measurement system in the frequency range of 8-40 GHz. The artificial chiral composites are fashioned by embedding chiral inclusions (metallic helices) into an epoxy medium (Eccogel) (Guire et al. 1990). One reflection measurement is made for each sample since the reflected field is linearly polarized as the incident wave. Two transmission measurements at different polarization directions are needed in order to fully characterize the transmitted polarization ellipse. The rotation angle and ellipticity of the transmitted polarization ellipse are calculated from these two transmission measurements. By examining the characteristics of the ellipticity and rotation angle, the Cotton effect is observed in the frequency range where the maximum power absorption occurs. This ensures that the left- and right-handed chiral composites can be represented as left- and right-handed electromagnetically active media, respectively, in the frequency range of interest. From one reflection and two transmission measurement data, the electromagnetic properties of chiral composites are for the first time computed numerically using a suitable inverse algorithm.

Citation Download Citation

Ru-Yen Ro, Vasundara V. Varadan, and Vijay K. Varadan "Experimental study of chiral composites", Proc. SPIE 1558, Wave Propagation and Scattering in Varied Media II, (11 November 1991); https://doi.org/10.1117/12.49633

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