Tuning transmission properties of 3D printed metal rod arrays by breaking the structural symmetry

De Jun Liu, Siqi Zhao, Borwen You, Sheng Syong Jhuo, Ja Yu Lu, Shuan Chou, Toshiaki Hattori

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)538-551
Number of pages14
JournalOptics Express
Volume29
Issue number2
DOIs
Publication statusPublished - 2021 Jan 18

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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