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Appl. Sci. 2018, 8(4), 617; https://doi.org/10.3390/app8040617

Waveguide Coupling via Magnetic Gratings with Effective Strips

1
Department of Physics and Advance Materials Manufacturing Processing Institute, University of North Texas, Denton, TX 76203, USA
2
UES, Inc., 4401 Dayton-Xenia Rd, Dayton, OH 45432, USA
3
Air Force Research Lab, Materials and Manufacturing Directorate, 3005 Hobson Way, Wright Patterson AFB, Dayton, OH 45433, USA
4
Sensor Science Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA
5
Center of Photonics & Quantum Materials, Skolkovo Institute of Science and Technology, 121205 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 20 February 2018 / Revised: 9 April 2018 / Accepted: 10 April 2018 / Published: 14 April 2018
(This article belongs to the Special Issue Metasurfaces: Physics and Applications)
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Abstract

Gratings with complex multilayer strips are studied under inclined incident light. Great interest in these gratings is due to applications as input/output tools for waveguides and as subwavelength metafilms. The structured strips introduce anisotropy in the effective parameters, providing additional flexibility in polarization and angular dependences of optical responses. Their characterization is challenging in the intermediate regime between subwavelength and diffractive modes. The transition between modes occurs at the Wood’s anomaly wavelength, which is different at different angle of incidence. The usual characterization with an effective film using permittivity ε and permeability μ has limited effectiveness at normal incidence but does not apply at inclined illumination, due to the effect of periodicity. The optical properties are better characterized with effective medium strips instead of an effective medium layer to account for the multilayer strips and the underlying periodic nature of the grating. This approach is convenient for describing such intermediate gratings for two types of applications: both metafilms and the coupling of incident waves to waveguide modes or diffraction orders. The parameters of the effective strips are retrieved by matching the spectral-angular map at different incident angles. View Full-Text
Keywords: metamaterials; homogenization; magnetic grating; waveguide coupling; metasurfaces metamaterials; homogenization; magnetic grating; waveguide coupling; metasurfaces
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Roccapriore, K.M.; Lyvers, D.P.; Brown, D.P.; Poutrina, E.; Urbas, A.M.; Germer, T.A.; Drachev, V.P. Waveguide Coupling via Magnetic Gratings with Effective Strips. Appl. Sci. 2018, 8, 617.

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