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Photonics
Volume 12
Issue 7
10.3390/photonics12070642
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Research on Metal Mesh Coupling Mirrors Utilizing Metasurfaces for Optically Pumped Gas THz Lasers

by
Lijie Geng
1,
Zhenxiang Fu
1,
Shuaifei Song
1,
Chenglong Bi
1,
Wenyan Zhang
1,
Ruiliang Zhang
1,
Kun Yang
1,2,* and
Yanchen Qu
3,*
1
School of Electronic and Information, Henan Province Optoelectronic Sensing and Information Processing Engineering Technology Research Center, Zhengzhou University of Light Industry, Zhengzhou 450000, China
2
School of Physics and Optoelectronic Engineering, Zhongyuan University of Technology, Zhenzhou 450007, China
3
National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China
*
Authors to whom correspondence should be addressed.
Photonics 2025, 12(7), 642; https://doi.org/10.3390/photonics12070642
Submission received: 3 April 2025 / Revised: 3 June 2025 / Accepted: 19 June 2025 / Published: 24 June 2025
(This article belongs to the Special Issue Recent Advances in Infrared Lasers and Applications)
Versions Notes

Abstract

Optically pumped gas terahertz (THz) lasers (OPGTLs) as reliable sources of THz radiation have been extensively utilized within THz application areas. In this paper, a substrate-free metal mesh coupler based on the metasurfaces principle was designed for continuous wave OPGTL, which is suitable for the Fabry–Perot (FP) THz resonator. The parameters of substrate-free metal mesh are calculated by the Ulrich equivalent circuit model, and the influence of metal mesh period and linewidth on its transmittance is analyzed quantitatively. Taking the THz laser with the 118.8 µm of CH3OH optically pumped by the 9.6 µm CO2 laser line for instance, two kinds of metal mesh were devised as input and output couplers of the resonator, and the transmittance and reflectance of the metal meshes are verified by the finite-difference time-domain (FDTD) method. Furthermore, the transmitted and reflected light fields of the FP resonant cavity metal mesh mirrors were simulated by using the FDTD method under the vertical incidence of both pump light and THz waves. Validation of the optical field characteristics of the substrate-free metal meshes confirmed their suitability as ideal input and output coupling cavity mirrors for FP resonant cavities in optically pumped gas THz lasers.
Keywords: terahertz; metal mesh; metasurfaces; resonator; optical field terahertz; metal mesh; metasurfaces; resonator; optical field

Share and Cite

MDPI and ACS Style

Geng, L.; Fu, Z.; Song, S.; Bi, C.; Zhang, W.; Zhang, R.; Yang, K.; Qu, Y. Research on Metal Mesh Coupling Mirrors Utilizing Metasurfaces for Optically Pumped Gas THz Lasers. Photonics 2025, 12, 642. https://doi.org/10.3390/photonics12070642

AMA Style

Geng L, Fu Z, Song S, Bi C, Zhang W, Zhang R, Yang K, Qu Y. Research on Metal Mesh Coupling Mirrors Utilizing Metasurfaces for Optically Pumped Gas THz Lasers. Photonics. 2025; 12(7):642. https://doi.org/10.3390/photonics12070642

Chicago/Turabian Style

Geng, Lijie, Zhenxiang Fu, Shuaifei Song, Chenglong Bi, Wenyan Zhang, Ruiliang Zhang, Kun Yang, and Yanchen Qu. 2025. "Research on Metal Mesh Coupling Mirrors Utilizing Metasurfaces for Optically Pumped Gas THz Lasers" Photonics 12, no. 7: 642. https://doi.org/10.3390/photonics12070642

APA Style

Geng, L., Fu, Z., Song, S., Bi, C., Zhang, W., Zhang, R., Yang, K., & Qu, Y. (2025). Research on Metal Mesh Coupling Mirrors Utilizing Metasurfaces for Optically Pumped Gas THz Lasers. Photonics, 12(7), 642. https://doi.org/10.3390/photonics12070642

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