通过非线性等离子金属表面发射器生成全息THz光束
Symeon Sideris1,2, Hu Zixian3, Cormac McDonnell1,2
1Department of Physical Electronics, School of Electrical Engineering, Tel-Aviv University, Tel Aviv 6997801, Israel.
ACS photonics
|August 21, 2023
概括
研究人员开发了一种新的方法,使用等离子超表面精确控制太赫兹 (THz) 辐射,使全息THz光束生成用于先进的成像应用.
科学领域:
- 光学和光子学 在光学和光子学.
- 超材料是指一种超材料.
- 特拉赫兹技术的技术.
背景情况:
- 太赫兹 (THz) 技术需要高效的来源来产生和塑造THz排放.
- 当前THz源对产生的电磁场提供有限的控制.
研究的目的:
- 为了实现深度亚波长,对当地的THz场幅度进行精确和连续的控制.
- 为了证明使用非线性等离子体元表面的全息THz光束生成.
主要方法:
- 在非线性潘查拉特纳姆-贝里相等离子体元表面内利用近场相互作用.
- 使用元表面来精确控制THz发射的振幅.
主要成果:
- 展示了精确形状的赫尔密特-高斯,顶帽子和三角形THz光束的生成.
- 实现了高阶模式的抑制,表明了最佳的非线性衍射效率.
- 展示了增强图像分辨率和对比度的应用.
结论:
- 开发的方法为THz排放提供了前所未有的控制.
- 这种技术对各种THz技术应用,包括先进的成像技术有很大的潜力.
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