Browsing by Subject "Subwavelength focusing"

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    Experimental study of subwavelength focusing by lefthanded metamaterials with a negative refractive index
    (2007) Özbay, Ekmel; Aydin, K.
    Two dimensional (2D) left-handed metamaterials (LHM) exhibiting negative refraction and subwavelength imaging are studied experimentally. A left-handed transmission band is observed at the frequencies where both dielectric permittivity and magnetic permeability are simultaneously negative. 2D LHM structure is verified to have a negative refractive index by measuring the refraction through a prism-shaped sample. Subwavelength focusing is observed by using a flat LHM superlens.
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    ItemOpen Access
    Negative refraction and subwavelength focusing using left-handed composite metamaterials
    (SPIE, 2008-01) Özbay, Ekmel; Aydın, Koray
    We review experimental studies performed on left-handed metamaterials (LHM) at microwave frequencies. The metamaterial structure is composed of periodic arrays of split-ring resonators and wire meshes and exhibits a left-handed propagation band at frequencies of negative permittivity and negative permeability. Negative refraction is verified using prism shaped LHM and also by beam-shifting method. Subwavelength focusing of a point source is achieved with a resolution of 0.13λ, through a flat LHM superlens.