Open AccessTuning transmission properties of 3D printed metal rod arrays by breaking the structural symmetry
Author(s) -
Dejun Liu,
Siqi Zhao,
Borwen You,
Sheng Syong Jhuo,
Ja Yu Lu,
Shu-An Chou,
Toshiaki Hattori
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.397474
Subject(s) - transmittance , optics , materials science , rod , photonic crystal , terahertz radiation , extraordinary optical transmission , waveguide , symmetry breaking , optoelectronics , physics , plasmon , surface plasmon , medicine , alternative medicine , pathology , quantum mechanics , surface plasmon polariton
In this work, one metallic photonic crystal waveguide composed of periodic metal rod arrays (MRAs) is experimentally and numerically demonstrated in terahertz frequencies. Such waveguides fabricated by 3D printers exhibit two resonant modes: the fundamental mode and the high-order mode, separating by a broad bandgap. Compared to the fundamental mode, the high-order mode shows higher field confinement and more sensitive to the geometry changes. By breaking the structure parameter, i.e., increasing or decreasing the metal rod interspace, the spectral positions, bandwidths, as well as the transmittances of high-order modes can be optimized. With broken symmetry in MRAs, the third resonant mode having high transmittance has emerged in the transmission spectrum. Results showing that fine-tuning in the alignment of metal rods leads to a great change in the transmission of high-order modes. These findings suggest that the transportation efficiency of THz waves through an MRA is tunable by breaking the structural symmetry.