Diffraction-free surface waves by metasurfaces.
Opt Lett
; 39(20): 5888-91, 2014 Oct 15.
Article
en En
| MEDLINE
| ID: mdl-25361111
ABSTRACT
We propose a method to design and realize planar Bessel lens using artificial metasurfaces to produce diffraction-free surface waves. The planar Bessel lens is composed of two sublenses a half Maxwell fisheye lens which can shape the surface cylindrical waves to surface plane waves, and an inhomogeneous flat lens which can convert the surface plane waves into approximate diffraction-free surface waves in a diamond-shaped focusing area. Through the planar Bessel lens, a point source on the metasurface directly radiates the diffraction-free surface waves. In realization, we construct the inhomogeneous metasurfaces by subwavelength metallic patches printed on a grounded dielectric substrate. Simulation and experimental results have good agreements, which jointly show the formation of the diffraction-free surface waves in the microwave band.
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Colección:
01-internacional
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MEDLINE
Idioma:
En
Revista:
Opt Lett
Año:
2014
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Article