title: Continuously tuning effective refractive index based on thermally controllable magnetic metamaterials.
abstract: By employing a thermally active magnetic material, we theoretically design a kind of electromagnetic metamaterial with intrinsic magnetic response, termed magnetic metamaterial (MM). The retrieved effective electric permittivity ε(eff) and magnetic permeability μ(eff) exhibit a nearly continuous transition from double negative to double zero, and then to double positive by controlling the temperature, indicating a flexible tunability of the effective refractive index. The beam splitting, collimation, focusing, and total reflection are achieved at different typical temperatures. Most importantly, with the MM implemented under a gradient temperature, a gradient negative-zero-positive index metamaterial (NZPIM) can possibly be realized, thus providing a new platform to study wave features in NZPIM.
authors.forename: Xinning
authors.initials: X
authors.lastname: Yu
authors.forename: Huajin
authors.initials: H
authors.lastname: Chen
authors.forename: Haixiao
authors.initials: H
authors.lastname: Lin
authors.forename: Jialin
authors.initials: J
authors.lastname: Zhou
authors.forename: Jingjing
authors.initials: J
authors.lastname: Yu
authors.forename: Chunxiu
authors.initials: C
authors.lastname: Qian
authors.forename: Shiyang
authors.initials: S
authors.lastname: Liu