Control of the electromagnetic response of dual-period arrays

M. LESTER; D. SKIGIN; R. DEPINE

Pamplona

Congreso; 2nd International Congress on Advanced Electromagnetic Materials in Microwaves and Optics; 2008

We present a novel way to control the efficiency of the diffraction orders by a dual-period structure.The unit cell is formed by a set of parallel wires with subwavelength cross section. By selectionof particular combinations of the geometrical parameters, the diffracted efficiencies can be eitherintensified or minimized. In addition, a blaze-like effect is produced when the plane that containsthe wire axes of each unit cell is not coincident with the periodicity direction. We developed a scalarmodel that permits us to design structures that either enhance or cancel out a given diffraction order.Numerical results obtained with a rigorous vectorial method show that these effects are independentof the constitutive parameters and the cross section profile of the wires.