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Dog bone triplet metamaterial wave plate

Mohamed, Imran, Pisano, Giampaolo, Ng, Ming Wah, Haynes, Vic and Maffei, Bruno 2012. Dog bone triplet metamaterial wave plate. Presented at: PIERS 2012, Kuala Lumpur, Malaysia, 27-30 March 2012. PIERS Proceedings 2012. The Electromagnetics Academy, pp. 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.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: left handed metamaterial; metamaterial; negative refractive index; pancharatnam; wave plate
Publisher: The Electromagnetics Academy
ISBN: 9781934142202
ISSN: 1559-9450
Last Modified: 04 Jun 2017 06:35
URI: http://orca-mwe.cf.ac.uk/id/eprint/62558

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