title: Manipulating negative-refractive behavior with a magnetic field.
abstract: We demonstrated a construction of negative-index material (NIM) with epsilon(eff)=mu(eff)=-1 employing ferrites only, with no metallic components. Our design of the NIM is motivated by recent coherent potential approximation results and corroborated by exact numerical calculation demonstrating the negative refraction of an electromagnetic beam, with equal incident and refraction angles, as well as by the slab imaging phenomena, with the source-image separation twice as the slab thickness. The ferrite only based scheme furnishes the fabricated NIM with magnetically tunable working frequency, less loss and the air-matched wave impedance.
authors.affiliation: Surface Physics Laboratory, Department of Physics, Fudan University, Shanghai 200433, China.
authors.forename: Shiyang
authors.initials: S
authors.lastname: Liu
authors.forename: Weikang
authors.initials: W
authors.lastname: Chen
authors.forename: Junjie
authors.initials: J
authors.lastname: Du
authors.forename: Zhifang
authors.initials: Z
authors.lastname: Lin
authors.forename: S T
authors.initials: ST
authors.lastname: Chui
authors.forename: C T
authors.initials: CT
authors.lastname: Chan