title: Subwavelength focusing and imaging by a multimode optical waveguide.
abstract: A simple subwavelength focusing system formed by a straight or bent multimode waveguide is investigated numerically. The simulation results indicate that an appropriately designed multimode waveguide can focus the outgoing waves of a point source and form an image with a full width at half-maximum of less than half a wavelength in the near-field area at the other side of the waveguide. The physical mechanism of the subwavelength focusing for this imaging system is explained.
authors.affiliation: Center for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Joint Research Center of Photonics of the Royal Institute of Technology (KTH), Sweden.
authors.forename: Xianyu
authors.initials: X
authors.lastname: Ao
authors.forename: Sailing
authors.initials: S
authors.lastname: He