Perfect Anomalous Refraction with Metagratings
Perfect Anomalous Refraction with Metagratings
- Author(s): A. Epstein and O. Rabinovich
- DOI: 10.1049/cp.2018.0838
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- Author(s): A. Epstein and O. Rabinovich Source: 12th European Conference on Antennas and Propagation (EuCAP 2018), 2018 page (5 pp.)
- Conference: 12th European Conference on Antennas and Propagation (EuCAP 2018)
- DOI: 10.1049/cp.2018.0838
- ISBN: 978-1-78561-816-1
- Location: London, UK
- Conference date: 9-13 April 2018
- Format: PDF
We present a methodology for designing metagratings for perfect anomalous refraction, based on multilayered loaded wire arrays. In recent work, it has been shown that such structures can implement perfect anomalous deflection and beam splitting in reflect-mode, using only a handful of subwavelength meta-atoms per (wavelength-scale) macro-period. Extending previous formulations to enable manipulation of transmitted fields as well, we derive analytical relations between the scattered fields, currents induced on the wires, and the individual load impedances, and enforce conditions that guarantee elimination of spurious scattering while retaining a passive and lossless structure. Utilizing our recent results, we demonstrate how the multilayered metagratings can be realized using realistic printed-capacitor loads, whose geometry can be analytically resolved. Thus, this design scheme, which can be fully implemented in MATLAB, prescribes simple physical structures, achieving optimal anomalous refraction efficiency without requiring even a single full-wave simulation. This paves the path for harnessing this novel concept for applications requiring control on transmitted diffraction modes (e.g., lenses), taking advantage of an efficient and rigorous design scheme, and simplified structure.
Inspec keywords: optical arrays; light refraction; optical metamaterials; diffraction gratings; optical design techniques; light polarisation; optical multilayers
Subjects: Other optical system components; Gratings, echelles; Optical system design; Optical metamaterials; Optical materials
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