title: The role of magnetic dipoles and non-zero-order Bragg waves in metamaterial perfect absorbers.
abstract: We develop a simple treatment of a metamaterial perfect absorber (MPA) based on grating theory. We analytically prove that the condition of MPA requires the existence of two currents, which are nearly out of phase and have almost identical amplitude, akin to a magnetic dipole. Furthermore, we show that non-zero-order Bragg modes within the MPA may consume electromagnetic energy significantly.
authors.affiliation: Theoretical Division, MS B213, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. yongz@lanl.gov
authors.forename: Yong
authors.initials: Y
authors.lastname: Zeng
authors.forename: Hou-Tong
authors.initials: HT
authors.lastname: Chen
authors.forename: Diego A R
authors.initials: DA
authors.lastname: Dalvit
mesh_terms: D000042:Absorption; D003198:Computer Simulation; D060526:Magnetic Fields; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation