Focusing by planoconcave lens using negative refraction

Vodo, P.; Parimi, P. V.; Lu, W. T.; Sridhar, S.
May 2005
Applied Physics Letters;5/16/2005, Vol. 86 Issue 20, p201108
Academic Journal
We demonstrate focusing of a plane microwave by a planoconcave lens fabricated from a photonic crystal having a negative refractive index and left-handed electromagnetic properties. An inverse experiment, in which a plane wave is produced from a source placed at the focal point of the lens, is also reported. A frequency-dependent negative refractive index, n(ω)<0 is obtained for the lens from the experimental data which match well with that determined from band structure calculations.


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