title: Metal nanoslit lenses with polarization-selective design.
abstract: We present comprehensive studies on thin diffraction lenses made of arrays of subwavelength, parallel nanoslits in a gold film. Such a nanoslit lens can operate either as a conventional convex or concave lens. The lenses can be designed to focus linearly polarized light with polarization either perpendicular (TM-lens) or parallel to the slits (TE-lens), while the orthogonal polarization diverges when passing through the lens. The designs of each lens are initially built on the dispersion relations for wave propagation through a parallel-plate waveguide. Both TM- and TE-lenses were realized experimentally, and full-wave numerical simulations fully support the experimental results.
authors.affiliation: Birck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA. sishii@purdue.edu
authors.forename: Satoshi
authors.initials: S
authors.lastname: Ishii
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Kildishev
authors.forename: Vladimir M
authors.initials: VM
authors.lastname: Shalaev
authors.forename: Kuo-Ping
authors.initials: KP
authors.lastname: Chen
authors.forename: Vladimir P
authors.initials: VP
authors.lastname: Drachev