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Dog Bone Triplet Metamaterial Wave Plate
Mohamed, Imran; Pisano, Giampaolo; Ng, Ming Wah; Haynes, Vic; Maffei, Bruno
In: PIERS 2012 Kuala Lumpur Proceedings: PIERS 2012 Kuala Lumpur; 27 Mar 2012-30 Mar 2012; Kuala Lumpur, Malaysia. The Electromagnetics Academy; 2012. p. 1756-1760.
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Abstract
Metamaterials are artificially made sub-wavelength structures arranged in periodic arrays. They can be designed to interact with electromagnetic radiation in many different and interesting ways such as allowing radiation to experience a negative refractive index (NRI). We have used this technique to design and build a quasi-optical Half Wave Plate (HWP} that exhibits a large birefringence by virtue of having a positive refractive index in one axis and a NRI in the other. Previous implementations of such NRI-HWP have been narrow band (~1-3%) due to the inherent reliance on needing a resonance to create the NRI region. We manufacture a W-band prototype of a novel HWP that uses the Pancharatnam method to extend the bandwidth (up to more than twice) of a usual NRI-HWP. Our simulated and experimentally obtained results despite their differences show that a broadening of a flat region of the phase difference is possible even with the initially steep gradient for a single plate.
Keyword(s)
left handed metamaterial; metamaterial; negative refractive index; pancharatnam; wave plate
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- Related website http://piers.org/piersproceedings/piers2012KualalumpurProc.php?searchname=Dog+Bone+Triplet+Metamaterial+Wave+Plate
- arXiv http://arxiv.org/abs/1401.3798