Total omnidirectional reflection by sub-wavelength gradient metallic gratings
College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, No.1 Shizi Street, Suzhou 215006, China
Received: 21 March 2016
Accepted: 17 May 2016
In this letter, we find that nearly total omnidirectional reflection could be achieved in a metallic grating structure with gradient index materials, regardless of the polarization of the incident wave. By bending the straight structure into a metallic grating ring, we design a metacage that can well shield the electromagnetic wave. All the phenomena are well demonstrated from theoretical analysis and numerical simulations.
PACS: 42.79.Dj – Gratings / 42.79.Ry – Gradient-index (GRIN) devices / 41.20.Gz – Magnetostatics; magnetic shielding, magnetic induction, boundary-value problems
© EPLA, 2016