Friday, August 29, 2014
Abstract-Structural control of metamaterial oscillator strength and electric field enhancement at terahertz frequencies
The design of artificial nonlinear materials requires control over internal resonant charge densities and local distributions. We present a MM design with a structurally controllable strength and local enhancement at terahertz frequencies. The MM consists of a split ring resonator (SRR) array stacked above an array of closed conducting rings. An in-plane, lateral shift of a half unit cell between the SRR and closed ring arrays results in an increase of the MM strength by a factor of 4 and a 40% change in the amplitude of the resonant enhancement in the SRR capacitive gap. We use and numerical simulations to confirm our results. We show that the observed response in this MM is the result of image and currents induced in the closed rings by the SRR.