title: Optical beam focusing with a metal slit array arranged along a semicircular surface and its optimization with a genetic algorithm.
abstract: A metal slit array arranged along a semicircular surface achieving subwavelength optical beam focusing along the lateral direction is proposed. Taking into consideration surface plasmon polaritons that pass through a metal slit array, we design the array with a curvature. By use of a genetic algorithm, the size of the metal slit and the corresponding curvature are to be determined. Based on our metal slit array configuration, the full width at half-maximum can be achieved on a subwavelength scale.
authors.affiliation: National Creative Research Center for Active Plasmonics Application Systems, Inter-University Semiconductor Research Center and School of Electrical Engineering, Seoul National University, Gwanak-Gu Gwanakro 599, Seoul 151-744, South Korea.
authors.forename: Dawoon
authors.initials: D
authors.lastname: Choi
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Lim
authors.forename: Sookyoung
authors.initials: S
authors.lastname: Roh
authors.forename: Il-Min
authors.initials: IM
authors.lastname: Lee
authors.forename: Jaehoon
authors.initials: J
authors.lastname: Jung
authors.forename: Byoungho
authors.initials: B
authors.lastname: Lee