Optical ‘magnetic mirror’ metasurfaces using interference between Fabry-Pérot cavity resonances in coaxial apertures

R Rajasekharan; A Roberts

Journal article

Optical ‘magnetic mirror’ metasurfaces using interference between Fabry-Pérot cavity resonances in coaxial apertures

R Rajasekharan, A Roberts

Scientific Reports | Macmillan Publishers Limited | Published : 2015

DOI: 10.1038/srep10297

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Abstract

Here we propose and computationally demonstrate a quasi-planar metasurface consisting of arrays of pairs of concentric coaxial apertures in a metallic film. The structure relies on destructive interference between Fabry-Pérot modes excited in each aperture at resonance producing transmitted fields that interfere destructively leading to suppressed transmission. Conversely, we show that in the case of a perfect conductor, near-perfect, broadband reflection can be achieved with zero phase change in the electric field and a variation of 2π on passing through the coincident resonances. Extending the concept to shorter wavelengths, we show that mirrors exhibiting close to a 2π phase excursion, al..

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University of Melbourne Researchers

Ranjith Rajasekharan Unnithan Author Electrical and Electronic Engineering

Ann Roberts Author Physics

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Funding Acknowledgements

This research was supported by a UM Interdisciplinary Seed Grant and the McKenzie Fellowship Scheme of The University of Melbourne. The authors also acknowledge funding received from the Melbourne Materials Institute (MMI) through the MMI-MCN merit time allocation scheme. AR acknowledges ARC support through Grant DP110100221. The numerical simulations were undertaken in part at the NCI National Facility in Canberra, Australia, which is supported by the Australian Commonwealth Government.