Fig. 3From: A slanted-nanoaperture metal lens: subdiffraction-limited focusing of light in the intermediate field regionBeam focusing by a tilted nanoslit array lens. a Schematic cross-section of an 8-slit Ag nanolens designed for 2λ focal length at λ = 633 nm. b FDTD simulation of transmission pattern: field intensity distribution. c The intensity distribution scanned at y = 1.0 µm. The central peak shows 210 nm FWHM, corresponding to 0.33λBack to article page