title: An optical reflectarray nanoantenna: the concept and design.
abstract: This paper presents the concept and design of a reflectarray nanoantenna at optical frequencies whose elements are nano-sized concentric spherical particles with the core made of ordinary dielectrics and the shell made of a plasmonic material. Modeling approaches based on finite difference time domain (FDTD) numerical method and dipole-modes scattering theory are used to characterize and tune the reflectarray design. A 6x6 elements reflectarray nanoantenna operating at wavelength 357.1nm with narrow beamwidth is presented, and its scanned radiation characteristics for 15 degrees and 30 degrees are demonstrated.
authors.affiliation: Applied EM and Optics Laboratory, ECE Department, Northeastern University Boston, Massachusetts 02115, USA. akrama@ece.neu.edu
authors.forename: Akram
authors.initials: A
authors.lastname: Ahmadi
authors.forename: Shabnam
authors.initials: S
authors.lastname: Ghadarghadr
authors.forename: Hossein
authors.initials: H
authors.lastname: Mosallaei
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D008962:Models, Theoretical; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*; D014159:Transducers