Chiral polymer coatings for microwave applications

Vijay K. Varadan; Vasundara V. Varadan

doi:10.1117/12.21658

1 October 1990 Chiral polymer coatings for microwave applications

Proceedings Volume 1307, Electro-Optical Materials for Switches, Coatings, Sensor Optics, and Detectors; (1990) https://doi.org/10.1117/12.21658
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

Electromagnetic waves can discriminate between objects of different handedness due to their transverse nature, which implies that the origin of chirality need not necessarily be molecular as in the case of optically active media. Effectively chiral composites may, therefore, be constructed by embedding chiral microstructures in non-chiral host media. Chiral polymer coatings for microwave applications consist of chiral inclusions dispersed in a dielectric matrix material. In our laboratory, chiral polymer coatings are realized by embedding a large number of miniature metal helical springs in a lossy polymeric material or by randomly dispersing microballoons filled with a chiral polymer in a lossy host material. Absorption and shielding are considerably enhanced due to the increased multiple scattering and subsequent absorption in the host material. An attractive application of chiral composites is as a broadband microwave absorber. In this paper, we will investigate the reflectivity reduction characteristics of chiral polymer coatings by changing the dielectric characteristics of the matrix material.

Citation Download Citation

Vijay K. Varadan and Vasundara V. Varadan "Chiral polymer coatings for microwave applications", Proc. SPIE 1307, Electro-Optical Materials for Switches, Coatings, Sensor Optics, and Detectors, (1 October 1990); https://doi.org/10.1117/12.21658

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