多通道太赫兹近乎完美的旋转束生成,由多功能元表面启用
Wanying Liu1, Quanlong Yang2, Quan Xu1
1Center for Terahertz Waves and College of Precision Instruments and Optoelectronics Engineering, and Key Laboratory of Optoelectronic Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China.
Nanophotonics (Berlin, Germany)
|December 5, 2024
概括
研究人员开发了一种新方法,用于生成可控制分歧的多通道太赫兹旋转束. 这种近乎完美的束 (Q-PVB) 的进步增强了太赫兹研究应用.
科学领域:
- 特拉赫兹 (THz) 光子学
- 地元表面光学学
- 轨道角动量 (OAM) 应用程序
背景情况:
- 带有轨道角动量 (OAM) 的束对于先进的太赫兹研究至关重要.
- 对于基于OAM的THz技术来说,生成多通道和可控制分歧的THz旋转束是必不可少的.
研究的目的:
- 引入和实验证明具有可控制分歧的近乎完美的旋转束 (Q-PVBs).
- 通过使用全介电式多功能元表面实现多通道Q-PVBs的生成.
主要方法:
- 通过叠加特定的相位函数来设计多功能元表面.
- 生成和表征多个具有不同拓电荷和分离的焦点的Q-PVB.
- 高分辨率的太赫兹电场测量以评估光束质量和属性.
主要成果:
- 成功生成了具有可控制和独立于拓电荷的分歧角度的Q-PVB.
- 证明了多通道Q-PVB生成,产生具有不同拓负载的四个通道.
- 描述证实了生成的Q-PVB的良好质量和宽带特性.
- 与传统的完美束相比,Q-PVB的分歧角度较小,环宽较薄.
结论:
- 拟议的全介电元面能够实现紧的,多通道的束生成.
- 这项技术为推进OAM相关的太赫兹研究提供了有前途的途径,包括模式分割复杂化和等离子增强.
相关概念视频
01:10Generating Electromagnetic Radiations
2.6K
The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
2.6K
01:28Standing Waves in a Cavity
865
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
865