Browsing by Subject "Left-handed metamaterial"
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Item Open Access Experimental observation of true left-handed metamaterial(IEEE, 2005) Aydın, Koray; Güven, Kaan; Özbay, EkmelWe report a true left-handed (LH) behavior in composite metamaterials. The magnetic resonance of the SRR structure is demonstrated. Plasma frequency of the LH material is shown to be lower than that of the wires.Item Open Access 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.Item Open Access The magical world of metamaterials(SPIE, 2009) Çağlayan, Hümeyra; Özbay, EkmelWe review experimental and theoretical studies performed on left-handed metamaterials (LHM). The metamaterials exhibit quiet unusual electromagnetic properties such as negative refraction, negative phase velocity, subwavelength focusing, subwavelength cavities and enhanced transmission.Item Open Access Negative refraction and focusing by a left-handed material slab in free space(IEEE, 2006) Aydın, Koray; Özbay, EkmelNegative refraction and focusing by a left-handed metamaterial (LHM) slab are experimentally verified. We measured refractive index of slab as -1.86. The flat lens behavior of LHM is demonstrated for two different point source distances. © 2006 Optical Society of America.Item Open Access Negative refraction and subwavelength focusing using left-handed composite metamaterials(SPIE, 2008-01) Özbay, Ekmel; Aydın, KorayWe 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.Item Open Access Science meets magic: photonic metamaterials(Society of Photo-Optical Instrumentation Engineers, 2012-05) Özbay, EkmelThe word "magic" is usually associated with movies, fiction, children stories, etc. but seldom with the natural sciences. Recent advances in metamaterials have changed this notion, in which we can now speak of "almost magical" properties that scientists could only dream about only a decade ago. In this article, we review some of the recent "almost magical" progress in the field of meta-materials. © 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).