Design, concepts, and applications of electromagnetic metasurfaces

Abstract

Abstract:The paper overviews our recent work on the synthesis of metasurfaces and related concepts and applications. The synthesis is based on generalized sheet transition conditions (GSTCs) with a bianisotropic surface susceptibility tensor model of the metasurface structure. We first place metasurfaces in a proper historical context and describe the GSTC technique with some fundamental susceptibility tensor considerations. On this basis, we next provide an in-depth development of our susceptibility-GSTC synthesis technique. Finally, we present five recent metasurface concepts and applications, which cover the topics of birefringent transformations, bianisotropic refraction, light emission enhancement, remote spatial processing, and nonlinear second-harmonic generation.

On the Use of Electromagnetic Inversion for Metasurface Design

“…In contrast to (12), the cost functional (13) is nonlinear due to the absence of phase information. 6 This cost functional is minimized using the CG algorithm where the gradient vector at the k th iteration (evaluated at x k ) can be derived as [48, Section 4.2.1]…”

“…E LECTROMAGNETIC metasurfaces are structures of subwavelength thickness that are composed of a subwavelength lattice of scattering elements [1]- [6]. In particular, transmitting metasurfaces, which are the focus of this paper, offer a systematic transformation of an incident field (input field) to a desired transmitted field (output field) by imposing appropriate surface boundary conditions.…”

Parallel integro-differential equation solving via multi-channel reciprocal bianisotropic metasurface augmented by normal susceptibilities

“…They provide prominent abilities for polarizing [25][26][27][28], absorbing [29][30][31][32], channeling [33][34][35][36][37][38][39][40], and processing [41][42][43][44] waves, especially within optical frequencies. Several analytical frameworks have been recently developed to synthesize metasurfaces at microscopic to macroscopic scales such as impedance/ admittance matrices [45,46], generalized sheet transition conditions (GSTCs) by susceptibility tensors [47,48], polarizability tensors [49][50][51], and local complex scattering parameters [39,[52][53][54]. These analytical or at least semi-analytical frameworks have common basis in concept of modeling metasurfaces as zero-thickness bianisotropic sheets, gathering effective tensorial parameters.…”

Nonreciprocal Phase Gradient Metasurface: Principle and Transistor Implementation

“…Metasurfaces have been shown to enable a myriad of wave transformations [1,2]. The vast majority of the works reported so far in this area have focused on reciprocal structures.…”