In terahertz (THz) technologies, generation and manipulation of THz waves are two key processes usually implemented by different device modules. Integrating THz generation and manipulation into a single compact device will advance the applications of THz technologies in various fields. Here, we demonstrate a hybrid nonlinear plasmonic metasurface incorporating an epsilon-near-zero (ENZ) indium tin oxide (ITO) layer to seamlessly combine efficient generation and manipulation of THz waves across a wide frequency band. The coupling between the plasmonic resonance of the metasurface and the ENZ mode of the ITO thin film enhances the THz conversion efficiency by more than 4 orders of magnitude. Meanwhile, such a hybrid device is capable of shaping the polarization and wavefront of the emitted THz beam via the engineered nonlinear Pancharatnam-Berry (PB) phases of the plasmonic meta-atoms. The presented hybrid nonlinear metasurface opens a new avenue toward miniaturized integrated THz devices and systems with advanced functionalities.

中文翻译：

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使用 Epsilon 近零混合非线性超表面的集成太赫兹发生器-操纵器

在太赫兹 (THz) 技术中，太赫兹波的产生和处理是通常由不同设备模块实现的两个关键过程。将太赫兹的产生和操作集成到一个紧凑的设备中，将推动太赫兹技术在各个领域的应用。在这里，我们展示了一种混合非线性等离子体超表面，它包含一个接近零的 epsilon (ENZ) 氧化铟锡 (ITO) 层，以在宽频带内无缝结合有效生成和操纵太赫兹波。超表面的等离子体共振与 ITO 薄膜的 ENZ 模式之间的耦合将太赫兹转换效率提高了 4 个数量级以上。同时，这种混合装置能够通过等离子超原子的工程非线性 Pancharatnam-Berry (PB) 相位对发射的太赫兹光束的偏振和波前进行整形。所提出的混合非线性超表面为具有先进功能的小型化集成太赫兹设备和系统开辟了一条新途径。