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. © 2012 SPIE.
A negative refractive index metamaterial wave plate for millimetre wave applications / Mohamed, I.; Pisano, G.; Ng, M. W.; Maffei, B.; Haynes, V.; Ozturk, F.. - 8452:(2012). (Intervento presentato al convegno Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI tenutosi a Amsterdam, nld) [10.1117/12.926931].
A negative refractive index metamaterial wave plate for millimetre wave applications
Pisano G.;
2012
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. © 2012 SPIE.File | Dimensione | Formato | |
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Mohamed_A negative refractive_2012.pdf
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