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Browsing by Author "Valagiannopoulos, Constantinos"

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Browsing by Author "Valagiannopoulos, Constantinos"

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  • Parity-Time Symmetric Nonlocal Metasurfaces: All-Angle Negative Refraction and Volumetric Imaging 
    Monticone, Francesco; Valagiannopoulos, Constantinos; Alù, Andrea (American Physical Society. Physical Review X, 2016)
    Lens design for focusing and imaging has been optimized through centuries of developments; however, conventional lenses, even in their most ideal realizations, still suffer from fundamental limitations, such as limits ...
  • Photonic crystals for optimal color conversion in light-emitting diodes: a semi-analytical approach 
    Valagiannopoulos, Constantinos; Lagoudakis, Pavlos G. (Nazarbayev University School of Science and Technology, 2018-04-13)
    Based on effective-medium approximation, we analytically optimize the color conversion of GaN-based light-emitting p–n junctions, with respect to the size and spatial density of the used photonic crystals (PhCs), being ...
  • PT-Symmetric planar devices for field transformation and imaging 
    Valagiannopoulos, Constantinos; Monticone, F.; Alù, A. (2016)
    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 ...
  • Radiation-Enhancing Reflector 
    Valagiannopoulos, Constantinos; Tretyakov, S. A. (IEEE, 2016)
    We show that it is possible to realize a passive planar reflector whose reflectivity (close to the resonant frequency of the reflector structure) is larger than unity. This reflector is strongly coupled to evanescent ...
  • Theoretical concepts of unlimited-power reflectors, absorbers, and emitters with conjugately matched layers 
    Valagiannopoulos, Constantinos; Tretyakov, Sergei A. (American Physical Society, 2016-09-12)
    Recently, it was shown that by using special artificial materials it is possible to ensure that all electromagnetic modes of free space are conjugately matched to the modes of a material body and, thus, all modes deliver ...
  • Waves in hyperbolic and double negative metamaterials including rogues and solitons 
    Boardman, A D; Alberucci, A; Assanto, G; Grimalsky, V V; Kibler, B; McNiff, J; Nefedov, I S; Rapoport, Yu G; Valagiannopoulos, Constantinos (Nanotechnology, 2017-10-20)
    The topics here deal with some current progress in electromagnetic wave propagation in a family of substances known as metamaterials. To begin with, it is discussed how a pulse can develop a leading edge that steepens and ...
  • Zeeman gyrotropic scatterers: Resonance splitting, anomalous scattering, and embedded eigenstates 
    Gangaraj, S Ali Hassani; Monticone, Francesco; Valagiannopoulos, Constantinos (Nanomaterials and Nanotechnology, 2018-09)
    Anomalous scattering effects (invisibility, superscattering, Fano resonances, etc) enabled by complex media and metamaterials have been the subject of intense efforts in the past couple of decades. In this article, we ...