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 language | English |
|---|---|
| Article number | 115114 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 95 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Mar 8 2017 |
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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 journal › Article
}
TY - JOUR
T1 - Magnified imaging based on non-Hermitian nonlocal cylindrical metasurfaces
AU - Savoia, Silvio
AU - Valagiannopoulos, Constantinos A.
AU - Monticone, Francesco
AU - Castaldi, Giuseppe
AU - Galdi, Vincenzo
AU - Alù, Andrea
PY - 2017/3/8
Y1 - 2017/3/8
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.95.115114
DO - 10.1103/PhysRevB.95.115114
M3 - Article
VL - 95
JO - Physical Review B
JF - Physical Review B
SN - 1098-0121
IS - 11
M1 - 115114
ER -