High-performance large-area terahertz detector based on the WTe2 film of Weyl semimetal with a subwavelength zigzag line array

A large-area terahertz detector based on a subwavelength zigzag line array on the Weyl semimetal film of WTe2 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 enhancem...

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Bibliographic Details
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
Subjects:
Arrays
Photoelectric effect
Room temperature
Terahertz frequencies
Online Access:Get full text
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Summary:A large-area terahertz detector based on a subwavelength zigzag line array on the Weyl semimetal film of WTe2 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 WTe2 under the bias voltage of 20 V were obtained with a photocurrent responsivity (Ri) of 9.51 mAW-1, a noise equivalent power (NEP) of 89.3 pWHz-1/2, and a detectivity (D*) of 4.25 x 109 cm Hz1/2W-1.-1.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.545642