Optical beam focusing with a metal slit array arranged along a semicircular surface and its optimization with a genetic algorithm.
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.
Choi
Dawoon
D
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.
Lim
Yongjun
Y
Roh
Sookyoung
S
Lee
Il-Min
IM
Jung
Jaehoon
J
Lee
Byoungho
B