Sub-millimeter wave transmission spectra of 2D polymer metamaterials using a Finite-Difference Time-Domain method
A program implementing the Finite-Difference Time-Domain method in two dimensional TMz case was created to simulate the transmission properties of polymer based metamaterials in the THz regime. The polymer modeled in this work was acrylonitrile butadiene styrene (ABS). The 4.8mm x 4.8mm metamaterial slabs tested were of ABS-air combinations with a checkerboard configuration of varying square cell size d, whose values (60 µm to 480 µm) were chosen according to the resolution of a 3D printer such that the metamaterial slabs can be replicated. The transmittance spectrum of each configuration between 0.2THz to 1.0THz were obtained. We have shown that resonant frequencies and peaks in transmittance appear after a minimum frequency for each d. We have observed that these resonance shift to the left with increasing d. These behaviours of the presented metamaterial structure can be utilized for applications in THz components such as filtering.