Abstract
Terahertz (THz) metasurfaces have opened up a new avenue for the THz wavefront modulation. However, high-efficient and low-cost fabrication of THz metasurfaces remains a great challenge today. Here, quasi-capsule-shaped polarization-multiplexed holographic THz metasurfaces were printed by a beam-shaped femtosecond laser. The laser beam was spatially modulated by holograms of optimized cylindrical lens loaded on a spatial light modulator (SLM). The size of quasi-capsule apertures can be exquisitely and flexibly controlled by adjusting the focal length in holograms, pulse energy, and pulse number. Based on near-field diffraction and Burch encoding, an array of 100 × 100 basic unit apertures were initially designed, and a polarization-multiplexed THz metasurface was finally printed with a dimension of 8 mm × 8 mm. The function of polarization multiplexing was demonstrated, by which two kinds of images were reconstructed in response to X and Y-polarization THz waves, respectively. The present work highlights a great leap in fabrication method for THz metasurfaces and hopefully stimulates the development of miniaturized and integrated THz systems.
© 2024 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Niyazi Ulas Dinc, Christophe Moser, and Demetri Psaltis
Opt. Lett. 49(2) 322-325 (2024)
Zikai Chen, Luping Wu, Bozhe Li, Rui Liu, Jianjun Ran, Yuji Wang, Zilun Luo, Jian Yu, Zhiyong Bai, Changrui Liao, and Yiping Wang
Opt. Lett. 49(3) 494-497 (2024)
Sumit Kumar Singh, Shun Notte, Ryuki Yamaguchi, Kenji Kinashi, Naoto Tsutsumi, Wataru Sakai, Yasuhiro Awatsuji, and Boaz Jessie Jackin
Opt. Lett. 49(4) 1053-1056 (2024)