Investigation of geometry-dependent field properties of 3D printed metallic photonic crystals

• DOI: 10.48550/arxiv.2003.06736
• Publication Date: 2020-01-01
• Authors: Liu, Dejun; Zhao, Siqi; You, Borwen; Hattori, Toshiaki
• Keywords: 0103 physical sciences; FOS: Physical sciences; 02 engineering and technology; 0210 nano-technology; 01 natural sciences; Physics - Optics; Optics (physics.optics)

One terahertz (THz) waveguide based on 3D printed metallic photonic crystals is experimentally and numerically demonstrated in 0.1-0.6 THz, which consists of periodic metal rod arrays (MRAs). Results demonstrated that such waveguide supports two waveguide modes such as fundamental and high-order TM-modes. The high-order TM-mode shows high field confinement, and it is sensitive to the geometry changes. By tuning the metal rod interspace, the spectral positions, bandwidths, and transmittances of the high-frequency band can be optimized. The investigation shows that a mode conversion between high-order modes occurs when the MRAs symmetry is broken via change the air interspace.