Reflecting Luneburg Lenses

Jorge Ruiz-Garcia (1) , Enrica Martini (2) , Cristian Della Giovampaola , David González-Ovejero (1) , Stefano Maci (2)

1 IETR - Institut d'Électronique et des Technologies du numéRique
2 Department of Information engineering and mathematics [Siena]

This paper presents the exact closed-form solution for a new planar lens, hereinafter referred to as Reflecting Luneburg Lens (RLL). The proposed structure consists of two stacked parallel plate waveguides of circular shape. The rays generated by a point source located at the periphery of the bottom waveguide propagate along curvilinear paths, whose trajectories result from a variable refractive index profile with azimuthal symmetry. Then, these rays encounter a reflecting boundary and emerge all parallel in the upper uniform waveguide. The behavior of this lens resembles that of a flat Luneburg lens, with the fundamental difference that it works in reflection. The exact refractive index profile is found by solving the non-linear integral equation of ray-congruence trough a truncated Abel transform method. The concept is numerically verified through different implementations of the effective refractive index profile, including a metasurface-based implementation. The proposed lens triggers new possibilities that the normal flat Luneburg lens does not offer, and it is applicable in a large variety of microwave, terahertz and optical devices.

Domaines: Sciences de l'ingénieur [physics]

Jorge Ruiz-Garcia, Enrica Martini, Cristian Della Giovampaola, David González-Ovejero, Stefano Maci. Reflecting Luneburg Lenses. IEEE Transactions on Antennas and Propagation, 2021, 69 (7), pp.3924-3935. ⟨10.1109/TAP.2020.3044668⟩. ⟨hal-03137418⟩