Double bow-tie antenna based 2D MoTe2 detector for terahertz wave detection

Nian Wang; Xianchao Liu; Zhiheng Zhang; Jun Wang

doi:10.1117/12.2651244

23 January 2023 Double bow-tie antenna based 2D MoTe₂ detector for terahertz wave detection

Nian Wang, Xianchao Liu, Zhiheng Zhang, Jun Wang

Proceedings Volume 12556, AOPC 2022: Optoelectronics and Nanophotonics; 125561K (2023) https://doi.org/10.1117/12.2651244
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

The wide band-gap of two-dimensional (2D) MoTe2 makes it impossible to directly detect terahertz waves. In this paper, a planar THz antenna-based 2D MoTe2 detection structure is proposed for THz detection. Numerical study shows that the designed and optimized double bow-tie Au planar antennas structure achieves extremely strong terahertz wave coupling in a narrow band at 0.1THz, and the absorption reaches 99.99%, and the enhanced local field distributed in central region of antennas. The absorption of the double bow-tie antennas is 1.3 times than that of the single bow-tie antennas with the same main structure parameters. When combine the double bow-tie antennas with 2D MoTe2, 0.1THz wave was detected by them under a small bias applied on the antennas. The carriers among the detector are brought about by the injected electrons from the Au antennas by the electromagnetic-induced well. The experimental results show that the detection structure has good ohmic characteristics, and the detection responsivity is 0.02mA/W, and the specific detection rate is 4.67×10 5Jones. This kind of antenna-based 2D materials terahertz wave detector can easily adjust detection wavelength by changing structure parameters of antennas, which has potential applications in terahertz detection technology.

Citation Download Citation

Nian Wang, Xianchao Liu, Zhiheng Zhang, and Jun Wang "Double bow-tie antenna based 2D MoTe₂ detector for terahertz wave detection", Proc. SPIE 12556, AOPC 2022: Optoelectronics and Nanophotonics, 125561K (23 January 2023); https://doi.org/10.1117/12.2651244

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