Ferromagnetic wire lattice with a tunable negative index of refraction for microwaves using an external magnetic fieldYun-Song Zhou1, Ben-Yuan Gu2 and Fu-He Wang1
1 Department of Physics, Capital Normal University - Beijing 100037, PRC
2 Institute of Physics, Chinese Academy of Sciences P.O. Box 603, Beijing 100080, PRC
received 11 June 2006; accepted 4 July 2006
published online 21 July 2006
A new structure of negative-refractive-index material is proposed, which is composed of ferromagnetic wires setting in two-dimensional Bravais lattice (FWL) with the application of external magnetic field. The refractive index of the FWL consisting of ferrum wires arranged in square lattice is calculated. The refractive index exhibits negative value in the GHz region. A notable characteristic of the FWL is that the negative refractive index is tunable by the applied external field.
41.20.Jb - Electromagnetic wave propagation; radiowave propagation.
73.20.Mf - Collective excitations (including excitons, polarons, plasmons and other charge-density excitations).
78.20.Ci - Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity).
© EDP Sciences 2006