• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2025, Vol. 61 ›› Issue (17): 281-290.doi: 10.3901/JME.2025.17.281

• 数字化设计与制造 • 上一篇    

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飞秒激光直写高Q值太赫兹柔性金属超材料

曾秋铭1,2, 黄异1,2, 钟舜聪1,2, 陈剑雄1, 钟宇杰1,2, 林廷玲1,2, 陈雪峰3   

  1. 1. 福州大学机械工程及自动化学院 福州 350108;
    2. 福州大学福建省太赫兹功能器件与智能传感重点实验室 福州 350108;
    3. 西安交通大学机械工程学院 西安 710049
  • 收稿日期:2024-09-08 修回日期:2025-02-21 发布日期:2025-10-24
  • 作者简介:曾秋铭,男,1997年出生,博士。主要研究方向为飞秒激光微纳加工技术、太赫兹功能器件。E-mail:479076368@qq.com;黄异(通信作者),男,1990年出生,博士,副研究员,硕士研究生导师。主要研究方向为微纳光学器件加工制造技术、太赫兹功能器件、太赫兹光谱分析与成像技术。E-mail:YiHuang@fzu.edu.cn
  • 基金资助:
    国家自然科学基金(52275096)、福建省技术创新重点攻关及产业化(2022G021)和福建省自然科学基金(2022J01071)资助项目。

High-quality Terahertz Flexible Metal Metamaterials Fabricated by Femtosecond Laser Direct Writing

ZENG Qiuming1,2, HUANG Yi1,2, ZHONG Shuncong1,2, CHEN Jianxiong1, ZHONG Yujie1,2, LIN Tingling1,2, CHEN Xuefeng3   

  1. 1. School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108;
    2. Fujian Provincial Key Laboratory of Terahertz Functional Devices and Intelligent Sensing, Fuzhou University, Fuzhou 350108;
    3. School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049
  • Received:2024-09-08 Revised:2025-02-21 Published:2025-10-24

摘要: 太赫兹超材料(THz-MMs)凭借其独特的电磁调控能力,成为高性能太赫兹功能器件的核心关键。当前THz-MMs的制备普遍需要结合多种硅基微加工工艺,制备过程繁复且往往涉及多种精密设备,导致制备周期长、成本高昂。提出飞秒激光直写金属薄膜的方法,利用飞秒激光极小热扩散的烧蚀特性和对脉冲能量的精确控制,实现太赫兹柔性金属超材料的一次成型加工。以所设计的混合矩形孔径柔性金属超材料作为范例,验证了该方法的有效性。实验结果表明,该飞秒激光直写的超材料支持两种表面等离子体模式之间的强耦合作用,在透射谱显示出高Q值拉比分裂峰。通过调整参数L2,分裂峰的频率从1.17 THz变化到0.97 THz,Q值从10.79提高到34.26。可以预见,飞秒激光直写技术有望为低成本、高性能的太赫兹功能器件的快速加工提供借鉴。

关键词: 太赫兹, 柔性金属超材料, 飞秒激光, 强耦合, 局域表面等离激元

Abstract: Terahertz metamaterials (THz-MMs) play a crucial role in high-performance terahertz functional devices due to their unique electromagnetic regulatory capabilities. However, the current preparation process for THz-MMs is complex and time-consuming, requiring the combination of various silicon-based micromachining processes and precision equipment, leading to high costs. A femtosecond laser writing method for metal thin films to address these challenges is proposed. By utilizing the minimal thermal diffusion ablation characteristics of femtosecond laser and precise control of pulse energy, the study successfully achieves a single forming process for terahertz flexible metal metamaterials. The effectiveness of the proposed method is demonstrated using a hybrid rectangular aperture flexible metal metamaterial as an example. Experimental results reveal that the femtosecond laser-written metamaterial supports strong coupling between two surface plasma modes and exhibits a high Q value Rabi splitting peak in the transmission spectrum. By adjusting parameter L2, the frequency of the splitting peak can be tuned from 1.17 THz to 0.97 THz, while the Q value increases from 10.79 to 34.26. These findings suggest that femtosecond laser direct writing technology has the potential to revolutionize the rapid processing of low-cost, high-performance terahertz functional devices.

Key words: terahertz, flexible metal metamaterials, femtosecond laser, strong coupling, localized surface plasmon polaritons

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