Chiral retrieval method based on right circularly polarized and left circularly polarized waves

The free-wave characterization of metamaterials is usually carried out by illuminating a sample with a linearly polarized plane electromagnetic wave. At points before and after the sample, sensors are introduced to measure the transverse components of the field, in order to compute the reflection an...

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Bibliographic Details
Published in:Measurement science & technology 2014-11, Vol.25 (11), p.115004-5
Main Authors: Martín, Ernesto, Muñoz, Juan, García-Collado, Ángel J, Margineda, José, Molina-Cuberos, Gregorio J
Format: Article
Language:English
Subjects:
Algorithms
Chirality
Circularity
Illumination
Mathematical analysis
Metamaterials
microwaves
Planes
Reflection
Retrieval
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Summary:The free-wave characterization of metamaterials is usually carried out by illuminating a sample with a linearly polarized plane electromagnetic wave. At points before and after the sample, sensors are introduced to measure the transverse components of the field, in order to compute the reflection and transmission coefficients related with the co- and cross-polar field components. Based on this information, retrieval algorithms allow parameters like rotation angle, effective chirality and refraction index to be calculated. Here we propose to use the transmission signals under illumination with plane circularly polarized waves, without sensing the reflection signal, to calculate the chirality parameter and the rotation angle due to the electromagnetic activity of the material. This new method, which allows a simpler characterization of a chiral slab, is applied to the study of metamaterials composed of both periodic and random distributions of metallic structures with chiral symmetry. The experimental results are contrasted with simulations and alternative measurements obtained using linearly polarized waves.
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/25/11/115004