Multi-functional terahertz nano-metasurface for beam-splitting and nonlinear resonance frequency shifting

• DOI: 10.1063/5.0252621
• Publication Date: 2025-01-15T15:31:23Z
• Authors: Jianghao Li; Jiahua Cai; Chunyan Geng; Deyin Kong; Mingxuan Zhang; Baogang Quan; Xianxun Yao; Guolin Sun; Xiaojun Wu
• Keywords: Nonlinear resonance

The emergence of terahertz (THz) nanoscale resonance metasurface devices represents an innovative method for modulating THz waves by utilizing the intense, high-frequency alternating electric field in radiation. However, compared to traditional modulation methods that employ electrical, optical, and other techniques, potential these still necessitates further exploration. In this work, we achieved beam-splitting field-induced nonlinear frequency shifting functions within a single nano-metasurface device. device consists split-ring resonators (s-SRRs) with nanogap on GaAs substrate. pattern design based Pancharatnam–Berry (P-B) phase principle can split incident wave into three beams. Meanwhile, its capability, which varies E-field, has been thoroughly investigated. performance was experimentally evaluated angle-resolved time-domain spectroscopy (THz-TDS) system strong-field THz-TDS system. This could serve as promising research platform integrating nano-optics holds ultrafast modulation, offering application prospects radar, wireless communication, electromagnetic protection.