Transmission and Confocal Imaging Characteristics of Bendable ABS/Ag-Coated Hollow Waveguide at Low THz Band

作者：Liu, Sheng; Xie, Guoxing; Li, Guishun; Yu, Shuoying; Lu, Xuehui; Yue, Fangyu; Liu, Shaohua; Jing, Chengbin^*; Gong, Cheng^*; Chu, Junhao

来源：IEEE Transactions on Terahertz Science and Technology, 2023, 13(3): 193-199.

DOI：10.1109/TTHZ.2023.3263628

• Acrylonitrile-butadiene-styrene (ABS)/Ag-coated hollow waveguide (HWG)
• bending transmission
• low-THz band
• terahertz (THz) waveguide imaging

A bendable Ag-coated hollow waveguide (HWG) based on the acrylonitrile-butadiene-styrene (ABS) tube is fabricated for low-loss transmission and imaging of low-frequency terahertz (THz) waves. ABS plastic tubing is selected since it allows growing a smooth silver (Ag) reflective film with good adhesion to the inner wall and contributes to constructing a bendable THz HWG structure. The low-loss transmission window of the ABS/Ag-coated HWG is at 0.2-1.0 THz. The attenuation characteristics of the as-prepared waveguide samples with different bore sizes (2.3, 3.2, and 4.2 mm) at 100 and 300 GHz are investigated. The 3.2-mm-bore THz waveguide exhibits good bendability and transmission performance. Its measured straight transmission loss is 1.02 dB/m at 300 GHz, and the bending loss reaches 1.56 dB/m at 150 degrees (the curvature radius is 10 cm). Moreover, a far-field confocal waveguidebased THz imaging system is established based on the ABS/Ag coated HWG. High-quality imaging with a super-resolution of 1.12 mm was achieved using the 3.2-mm-bore waveguide samples at 100 GHz.

• 单位
  南开大学