Focusing the electromagnetic wave with a magnetic field.
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.
Chen
Shaowen
S
Surface Physics Laboratory, Fudan University, Shanghai, China.
Du
Junjie
J
Liu
Shiyang
S
Lin
Zhifang
Z
Chui
S T
ST