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A negative refractive index metamaterial wave plate for millimetre-wave applications

Holland, Wayne S., Mohamed, I., Pisano, Giampaolo, Ng, M. W., Maffei, Bruno, Haynes, V. and Ozturk, F. 2012. A negative refractive index metamaterial wave plate for millimetre-wave applications. Presented at: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, Amsterdam, The Netherlands, 3-6 July 2012. Published in: Holland, Wayne S. and Zmuidzinas, Jonas eds. Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI (Proceedings). Proceedings of the SPIE Bellingham, WA: SPIE, p. 845228. 10.1117/12.926931

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Abstract

By use of a metamaterial based on the ‘cut wire pair’ geometry, highly birefringent wave plates may be constructed by virtue of the geometry’s ability of having a negative and positive refractive index along its perpendicular axes. Past implementations have been narrow band in nature due to the reliance on producing a resonance to achieve a negative refractive index band and the steep gradient in the phase difference that results. In this paper we attempt to design and manufacture a W-band quarter wave plate embedded in polypropylene that applies the Pancharatnam method to increase the useable bandwidth. Our modelling demonstrates that a broadening of the phase difference’s bandwidth defined as the region 90° ± 2° is possible from 0.6% (101.7 GHz – 102.3 GHz) to 7.8% (86.2 GHz – 93.1 GHz). Our experimental results show some agreement with our modelling but differ at higher frequencies.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: Metamaterials; Refractive index; Wave plates; Modeling; Manufacturing
Publisher: SPIE
ISBN: 9780819491534
ISSN: 0277-786X
Related URLs:
Last Modified: 04 Jun 2017 06:28
URI: http://orca.cf.ac.uk/id/eprint/60479

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