Physics

Permanent URI for this community

https://testres.nu.edu.kz/handle/123456789/512

Browse

Browsing Physics by Author "Alù, A."

Now showing 1 - 1 of 1
  • Thumbnail Image
    ItemOpen Access
    PT-Symmetric planar devices for field transformation and imaging
    (2016) Valagiannopoulos, Constantinos; Monticone, F.; Alù, A.
    The powerful tools of transformation optics (TO) allow an effective distortion of a region of space by carefully engineering the material inhomogeneity and anisotropy, and have been successfully applied in recent years to control electromagnetic fields in many different scenarios, e.g., to realize invisibility cloaks and planar lenses. For various field transformations, it is not necessary to use volumetric inhomogeneous materials, and suitably designed ultrathin metasurfaces with tailored spatial or spectral responses may be able to realize similar functionalities within smaller footprints and more robust mechanisms. Here, inspired by the concept of metamaterial TO lenses, we discuss field transformations enabled by parity-time (PT) symmetric metasurfaces, which can emulate negative refraction. We first analyze a simple realization based on homogeneous and local metasurfaces to achieve negative refraction and imaging, and we then extend our results to arbitrary PT-symmetric two-port networks to realize aberration-free planar imaging