Magnified imaging based on non-Hermitian nonlocal cylindrical metasurfaces

Silvio Savoia, Constantinos A. Valagiannopoulos, Francesco Monticone, Giuseppe Castaldi, Vincenzo Galdi, Andrea Alù

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We show that a cylindrical lensing system composed of two metasurfaces with suitably tailored non-Hermitian (i.e., with distributed gain and loss) and nonlocal (i.e., spatially dispersive) properties can perform magnified imaging with reduced aberrations. More specifically, we analytically derive the idealized surface-impedance values that are required for "perfect" magnification and imaging and elucidate the role and implications of non-Hermiticity and nonlocality in terms of spatial resolution and practical implementation. For a basic demonstration, we explore some proof-of-principle quasilocal and multilayered implementations and independently validate the outcomes via full-wave numerical simulations. We also show that the metasurface frequency-dispersion laws can be chosen so as to ensure unconditional stability with respect to arbitrary temporal excitations. These results, which extend previous studies on planar configurations, may open intriguing venues in the design of metastructures for field imaging and processing.

Original languageEnglish
Article number115114
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume95
Issue number11
DOIs
Publication statusPublished - Mar 8 2017

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Imaging techniques
magnification
aberration
spatial resolution
impedance
Aberrations
Demonstrations
configurations
excitation
simulation
Computer simulation
Processing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Magnified imaging based on non-Hermitian nonlocal cylindrical metasurfaces. / Savoia, Silvio; Valagiannopoulos, Constantinos A.; Monticone, Francesco; Castaldi, Giuseppe; Galdi, Vincenzo; Alù, Andrea.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 95, No. 11, 115114, 08.03.2017.

Research output: Contribution to journalArticle

Savoia, Silvio ; Valagiannopoulos, Constantinos A. ; Monticone, Francesco ; Castaldi, Giuseppe ; Galdi, Vincenzo ; Alù, Andrea. / Magnified imaging based on non-Hermitian nonlocal cylindrical metasurfaces. In: Physical Review B - Condensed Matter and Materials Physics. 2017 ; Vol. 95, No. 11.
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