Work

Negative Refraction and Planar Focusing Based on Parity-Time Symmetric Metasurfaces

Year: 2014

Type: article

Abstract: We introduce a new mechanism to realize negative refraction and planar focusing using a pair of parity-time symmetric metasurfaces. In contrast to existing solutions that achieve these effects with negative-index metamaterials or phase conjugating surfaces, the proposed parity-time symmetric lens enables loss-free, all-angle negative refraction and planar focusing in free space, without relying on bulk metamaterials or nonlinear effects. This concept may represent a pivotal step towards loss-free negative refraction and highly efficient planar focusing by exploiting the largely uncharted scattering properties of parity-time symmetric systems.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.113.023903

Authors: Romain Fleury, Dimitrios L. Sounas, Andrea Alù

Institution: The University of Texas at Austin

Language: English

Topic: Metamaterials and Metasurfaces Applications

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: Defense Threat Reduction Agency, Air Force Office of Scientific Research

Awards: G4563661524, G6712724148