NDLI: Flat Optics for Surface Waves

Content Provider	IEEE Xplore Digital Library
Author	Martini, E. Mencagli, M. Gonzalez-Ovejero, D. Maci, S.
Copyright Year	1963
Abstract	The name flat optics (FO) has been introduced in a recent paper by Capasso's group for denoting light-wave manipulations through a general type of penetrable or impenetrable metasurfaces (MTSs). There, the attention was focused on plane waves, whereas here we treat surface waves (SWs) excited on impenetrable impedance surfaces. Space variability of the boundary conditions imposes a deformation of the SW wavefront, which addresses the local wavector along not-rectilinear paths. The ray paths are subjected to an eikonal equation analogous to the one for geometrical optics (GO) rays in graded index materials. The basic relations among ray paths, ray velocity, and transport of energy for both isotropic and anisotropic boundary conditions are presented for the first time. This leads to an elegant formulation which allows for closed form analysis of flat operational devices (lenses or beam formers), giving a new guise to old concepts. It is shown that when an appropriate transformation is found, the ray paths can be conveniently controlled without the use of ray tracing, thus simplifying the problem and leading to a flat version of transformation optics, which is framed here in the general FO theory.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	155
Ending Page	166
Page Count	12
File Size	2487415
File Format	PDF
ISSN	0018926X
Volume Number	64
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optics Surface impedance Optical surface waves Impedance Surface waves Boundary conditions Surface treatment Ray Tracing Metasurfaces Surface-waves Geometrical Optics Transformation Optics transformation optics Geometrical optics metasurfaces ray tracing surface waves
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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