Laser‐Printed Terahertz Plasmonic Phase‐Change Metasurfaces

作者：Ying Zeng, Dunzhu Lu, Xingxing Xu, Xiaoqiuyan Zhang, Hujie Wan, Junqin Wang, Xuju Jiang, Xiaosheng Yang, Ming Xu, Qiye Wen, Jianquan Yao, Min Hu, Xinliang Zhang, Peining Li · 发表于：Advanced Optical Materials · 年份：2023 · DOI：10.1002/adom.202202651 · 被引用次数：25 · 研究领域：Metamaterials and Metasurfaces Applications、Terahertz technology and applications、Plasmonic and Surface Plasmon Research

Abstract Chalcogenide phase‐change materials (PCMs) have offered an appealing material solution by acting as a switchable dielectric layer to tune the electromagnetic properties of terahertz metamaterials and metasurfaces. Here, this work demonstrates large‐scale and lithography‐free manufacturing of all‐PCM terahertz metasurfaces based on direct laser switching of crystalline micro‐domains in a thin film with high switching ratio of the emerging plasmonic PCM, In 3 SbTe 2 (IST). The fabricated high‐quality IST metasurfaces achieve efficient plasmonic resonances and a large modulation depth with ultrafast response (full width at half maxima of the modulation time ≈1.6 ps) in a deep‐subwavelength switching volume. For the dynamic evolution of terahertz resonance modes, theoretical modeling reveals a delicate interplay between amorphous and crystalline IST due to the bonding‐structure‐induced different carrier lifetimes and spatially localized electric fields. These studies open new avenues for realizing all‐PCM terahertz ultrafast nanophotonics.