Metasurfaces represent a new frontier in materials science paving for unprecedented methods of controlling electromagnetic waves, with a range of applications spanning from sensing to imaging and communications. For pulsed terahertz (THz) generation, metasurfaces offer a gateway to tuneable thin emitters that can be utilized for large‐area imaging, microscopy, and spectroscopy. In literature, THz‐emitting metasurfaces generally exhibit high absorption, being based either on metals or on semiconductors excited in highly resonant regimes. Here, the use of a fully dielectric semiconductor exploiting morphology‐mediated resonances and inherent quadratic nonlinear response is proposed. This system exhibits a remarkable 40‐fold efficiency enhancement compared to the unpatterned at the peak of the optimized wavelength range, demonstrating its potential as a scalable emitter design.

中文翻译：

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用于超快太赫兹脉冲生成的谐振全介电超表面

超表面代表了材料科学的新前沿，为前所未有的控制电磁波的方法铺平了道路，其应用范围涵盖从传感到成像和通信。对于脉冲太赫兹（THz）的产生，超表面提供了可调谐薄发射器的途径，可用于大面积成像、显微镜和光谱学。在文献中，发射太赫兹的超表面通常表现出高吸收，基于在高谐振状态下激发的金属或半导体。在这里，提出使用利用形态介导的共振和固有的二次非线性响应的全介电半导体。与未图案化的优化波长范围峰值相比，该系统的效率显着提高了 40 倍，展示了其作为可扩展发射器设计的潜力。