Engineering space for light via transformation optics
Date of this VersionJanuary 2008
January 1, 2008 / Vol. 33, No. 1 / OPTICS LETTERS
This document has been peer-reviewed.
Conceptual studies and numerical simulations are performed for imaging devices that transform a near-field pattern into magnified far-zone images and are based on high-order spatial transformation in cylindrical domains. A lens translating a near-field pattern from an almost circular input boundary onto a magnified far-field image at a flat output boundary is considered. The lens is made of a metamaterial with anisotropic permittivity and permeability both depending on a single '' scaling '' parameter of the transformation. Open designs of the lens with a truncated body (3/4-body and 1/4-body lenses) are suggested and analyzed. It is shown that the ideal full lens and the 3/4-body lens produce identical images. Numerical simulations of 1/4-body designs indicate that further truncation of the lens could limit its performance. Alight concentrator '' focusing '' far-zone fields into a nanometer-scale area is also considered.