High-performance large-area terahertz detector based on the WTe 2 film of Weyl semimetal with a subwavelength zigzag line array

• Published in: Applied optics (2004) 2025-01, Vol.64 (2), p.467
• Main Authors: Wang, Yifei, Jia, Erse, Peng, Zhongze, Chen, Run, Chai, Lu, Hu, Minglie
• Format: Article
• Language: English
• ISSN: 1559-128X; 2155-3165
• DOI: 10.1364/AO.545642

A large-area terahertz detector based on a subwavelength zigzag line array on the Weyl semimetal film of WTe 2 was designed and prepared. A high-performance device, on account of the combination of the absorption characteristic of Weyl semimetals for long-wave photons with low energy and the enhancement effect of the localized surface plasmon by virtue of a subwavelength zigzag line array structure, has been demonstrated by a numerical simulation and experimental verification. A high-performance detection ability of a large 3.8 mm square area for a 0.1 THz wave at room temperature was verified. The characteristic parameters of the detection ability for the device with a 70 µm line width of WTe 2 under the bias voltage of 20 V were obtained with a photocurrent responsivity ( R i ) of 9.51mAW −1 , a noise equivalent power (NEP) of 89.3pWHz −1/2 , and a detectivity ( D ∗ ) of 4.25×10 9 cmHz 1/2 W −1 .