Near-field imaging with a loaded wire medium
Kaipa, C. S. R.
; Yakovlev, A.
Maslovski , S.
Silveirinha, M. G.
Physical Review B Vol. 86, Nº 155103, pp. 1 - 10, October, 2012.
ISSN (print): 1098-0121
ISSN (online): 1098-0121
Journal Impact Factor: 3,736 (in 2014)
Digital Object Identifier: 10.1103/PhysRevB.86.155103
It is shown that a bi-layer mushroom structure formed by two coupled metallic grids may enable the resonant enhancement of the near field and superlensing at microwave and terahertz frequencies, to some extent analogous to the silver lens at UV. The charge density waves supported by the two grids can be strongly coupled, even if the thickness of the bi-layer mushroom is a significantly large fraction of the wavelength. The imaging properties can be controlled by changing the structural parameters of the bi-layer mushroom.