Figure 6. Results of finite-difference time-domain simulations.
(a) 3D plot of the electric field strength at the resonant frequency of 0.73 THz, when the series of five dielectric spheres (with εf = 8) are placed in the micro-gap of the metamaterials. Shown on the right is a 2D cross-sectional image taken along the dashed line in the 3D plot. (b) THz transmission spectra for the cases in which the dielectric constant of each of the five spheres are of εf = 1 (blue line) and εf = 8 (red line), respectively. (c) A plot of resonant frequency shift as a function of the number of spheres, for five different εf's ranging from 2 to 10.