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Proceedings Paper

Focusing and negative refraction in anisotropic indefinite permittivity media
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Paper Abstract

Materials that exhibit negative refraction demonstrate physical phenomena that may be used for novel applications. This work serves to evaluate the possibility of hyperbolic focusing due to an indefinite anisotropic permittivity tensor. Two single-loop antennas were used to approximately achieve a transverse magnetic (TM) point source and detector. Using an Agilent 8510C Vector Network Analyzer (VNA), the frequency spectrum was scanned between 7 and 9 GHz. Relative gain or loss measurements were taken at equal spatial steps around the center of the sample. A scanning robot allowed for the automatic scanning of the space behind the sample in the x, y, and z directions, to establish the focusing patterns, and to compare the signal amplitudes in the presence and absence of the sample. The robot was controlled using LabVIEW, which also collected the data from the VNA and passed it to Matlab for processing. A soft focusing spot was observed when the antennas were placed in a symmetric configuration with respect to the sample. These results suggest a method of focusing electromagnetic waves using negative refraction in indefinite materials.

Paper Details

Date Published: 6 April 2009
PDF: 4 pages
Proc. SPIE 7287, Electroactive Polymer Actuators and Devices (EAPAD) 2009, 72870Y (6 April 2009); doi: 10.1117/12.821019
Show Author Affiliations
Sara Marshall, Univ. of California, San Diego (United States)
Alireza V. Amirkhizi, Univ. of California, San Diego (United States)
Sia Nemat-Nasser, Univ. of California, San Diego (United States)

Published in SPIE Proceedings Vol. 7287:
Electroactive Polymer Actuators and Devices (EAPAD) 2009
Yoseph Bar-Cohen; Thomas Wallmersperger, Editor(s)

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