204 citations · 513 across the 8 of their papers we have counts for
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Magnified imaging based on non-Hermitian nonlocal cylindrical metasurfaces
Silvio Savoia, Constantinos A. Valagiannopoulos, Francesco Monticone +3
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 dis…
Non-Hermiticity-Induced Wave Confinement and Guiding in Loss-Gain-Loss Three-Layer Systems
Silvio Savoia, Giuseppe Castaldi, Vincenzo Galdi
Following up on previous studies on parity-time-symmetric gain-loss bi-layers, and inspired by formal analogies with plasmonic waveguides, we study non-Hermiticity-induced wave con…
-Symmetry-Induced Wave Confinement and Guiding in Epsilon-Near-Zero Metamaterials
Silvio Savoia, Giuseppe Castaldi, Vincenzo Galdi +2
Inspired by the parity-time symmetry concept, we show that a judicious spatial modulation of gain and loss in epsilon-near-zero metamaterials can induce the propagation of exponent…
Tunneling of Obliquely-Incident Waves through PT-Symmetric Epsilon-Near-Zero Bi-Layers
Silvio Savoia, Giuseppe Castaldi, Vincenzo Galdi +2
We show that obliquely-incident, transversely-magnetic-polarized plane waves can be totally transmitted (with zero reflection) through epsilon-near-zero (ENZ) bi-layers characteriz…
Surface sensitivity of Rayleigh anomalies in metallic nanogratings
Silvio Savoia, Armando Ricciardi, Alessio Crescitelli +4
Sensing schemes based on Rayleigh anomalies (RAs) in metal nanogratings exhibit an impressive bulk refractive-index sensitivity determined solely by the grating period. However, th…
Optical nonlocality in multilayered hyperbolic metamaterials based on Thue-Morse superlattices
Silvio Savoia, Giuseppe Castaldi, Vincenzo Galdi
We show that hyperbolic electromagnetic metamaterials implemented as multilayers based on two material constituents arranged according to Thue-Morse (ThM) aperiodic sequence may ex…
PT Metamaterials via Complex-Coordinate Transformation Optics
Giuseppe Castaldi, Silvio Savoia, Vincenzo Galdi +2
We extend the transformation-optics paradigm to a complex spatial coordinate domain, in order to deal with electromagnetic metamaterials characterized by balanced loss and gain, gi…
Analytical Study of Sub-Wavelength Imaging by Uniaxial Epsilon-Near-Zero Metamaterial Slabs
Giuseppe Castaldi, Silvio Savoia, Vincenzo Galdi +2
We discuss the imaging properties of uniaxial epsilon-near-zero metamaterial slabs with possibly tilted optical axis, analyzing their sub-wavelength focusing properties as a functi…