title: Finite-size nondiffracting beam from a subwavelength metallic hole with concentric dielectric gratings.
abstract: We show that finite-size nondiffracting beams can be generated by a subwavelength metallic hole with surrounding dielectric grating structures. An analytic field model that describes the diffractive formation of finite-size nondiffracting beams is addressed. The generation of finite-size nondiffracting beams from a subwavelength metallic hole with surrounding concentric dielectric binary gratings is numerically demonstrated by three-dimensional rigorous coupled wave analysis.
authors.affiliation: National Creative Research Center for Active Plasmonics Application Systems, Inter-UniversitySemiconductor Research Center and School of Electrical Engineering, Seoul NationalUniversity, Gwanak-Gu Gwanakro 599, Seoul 151-744, South Korea.
authors.forename: Hwi
authors.initials: H
authors.lastname: Kim
authors.forename: Junghyun
authors.initials: J
authors.lastname: Park
authors.forename: Byoungho
authors.initials: B
authors.lastname: Lee