Sideris Symeon, Zixian Hu, McDonnell Cormac, Li Guixin, Ellenbogen Tal
Department of Physical Electronics, School of Electrical Engineering, Tel-Aviv University, Tel Aviv 6997801, Israel.
Center for Light-Matter Interaction, Tel-Aviv University, Tel-Aviv 6779801, Israel.
ACS Photonics. 2023 Aug 1;10(8):2972-2979. doi: 10.1021/acsphotonics.3c00775. eCollection 2023 Aug 16.
The advancement of terahertz (THz) technology hinges on the progress made in the development of efficient sources capable of generating and shaping the THz emission. However, the currently available THz sources provide limited control over the generated field. Here, we use near-field interactions in nonlinear Pancharatnam-Berry phase plasmonic metasurfaces to achieve deep subwavelength, precise, and continuous control over the local amplitude of the emitted field. We show that this new ability can be used for holographic THz beam generation. Specifically, we demonstrate the generation of precisely shaped Hermite-Gauss, Top-Hat, and triangular beams. We show that using this method, higher-order modes are completely suppressed, indicating optimal nonlinear diffraction efficiency. In addition, we demonstrate the application of the generated structured beams for obtaining enhanced imaging resolution and contrast. These demonstrations hold immense potential to address challenges associated with a broad range of new applications employing THz technology.
太赫兹（THz）技术的进步取决于能够产生和塑造太赫兹辐射的高效源的开发进展。然而，目前可用的太赫兹源对所产生的场的控制有限。在此，我们利用非线性潘查拉特纳姆 - 贝里相位等离子体超表面中的近场相互作用，实现对发射场局部幅度的深亚波长、精确且连续的控制。我们表明，这种新能力可用于全息太赫兹光束生成。具体而言，我们展示了精确形状的厄米 - 高斯光束、平顶光束和三角光束的生成。我们表明，使用这种方法，高阶模式被完全抑制，这表明具有最佳的非线性衍射效率。此外，我们展示了所生成的结构化光束在获得增强的成像分辨率和对比度方面的应用。这些演示对于应对与采用太赫兹技术的广泛新应用相关的挑战具有巨大潜力。
