title: Reverse chromatic aberration and its numerical optimization in a metamaterial lens.
abstract: In planar metamaterial lenses, the focal point moves with the frequency. Here it is shown numerically that this movement can be controlled by properly engineering the dimensions of the metamaterial-based phase shifters that constitute the lens. In particular, such lenses can be designed to exhibit unusual chromatic aberration with the focal length increasing, rather than decreasing, with the frequency. It is proposed that such an artificial "reverse" chromatic aberration may optimize the transverse resolution of millimeter wave diagnostics of plasmas and be useful in compensating for the natural "ordinary" chromatic aberration of other components in an optical system. More generally, optimized chromatic aberration will allow for simultaneous focusing of several objects located at different distances and emitting or reflecting at different frequencies.
authors.affiliation: University of Wisconsin-Madison, Madison, Wisconsin 53706, USA. capecchi@wisc.edu
authors.forename: William J
authors.initials: WJ
authors.lastname: Capecchi
authors.forename: Nader
authors.initials: N
authors.lastname: Behdad
authors.forename: Francesco A
authors.initials: FA
authors.lastname: Volpe