title: Focusing the electromagnetic wave with a magnetic field.
abstract: We examine manipulating the electromagnetic (EM) wave with an external static magnetic field (ESMF) taking advantage of the versatility of the magnetic photonic crystal (PC). The effect of a nonuniform ESMF on the permeability of the constituent magnetic material in the PC is demonstrated to create a gradient of the effective optical index in the crystal, leading to the focusing of the EM wave, with a magnetically tunable focal length, focused waist radius, and the intensity at the focus.
authors.affiliation: Surface Physics Laboratory, Fudan University, Shanghai, China.
authors.forename: Shaowen
authors.initials: S
authors.lastname: Chen
authors.forename: Junjie
authors.initials: J
authors.lastname: Du
authors.forename: Shiyang
authors.initials: S
authors.lastname: Liu
authors.forename: Zhifang
authors.initials: Z
authors.lastname: Lin
authors.forename: S T
authors.initials: ST
authors.lastname: Chui