Multifocal flat lens with left-handed metamaterial

Wilson, Jeffrey D.; Schwartz, Zachary D.
January 2005
Applied Physics Letters;1/10/2005, Vol. 86 Issue 2, p021113
Academic Journal
We show experimental results demonstrating multiple focal lengths at microwave frequencies in a flat lens constructed of left-handed metamaterial (LHM). In contrast to conventional lenses, which are constructed of materials with positive index and require a curved surface or inhomogeneous structures to focus light or other electromagnetic radiation, no curvature is needed with a LHM because of a negative effective index of refraction. Such a flat lens has the advantage of being capable of changing the focal length by simply changing the distance between the electromagnetic source and the lens.


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