相关实验视频

Updated: May 28, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

从连续主机的少数层范德瓦尔斯超表面中从边界状态生成第二次波

Naseer Muhammad¹, Azra Begum¹, Zhaoxian Su¹

¹School of Optics and Photonics, Beijing Engineering Research Center of Mixed Reality and Advanced Display, Beijing Institute of Technology, Beijing 100081, China.

Nanophotonics (Berlin, Germany)

|February 10, 2025

概括

这项研究表明,几层过渡金属二甲基化物 (TMDs) 的元表面支持连续性的边界状态 (BICs). 这些结构实现了高效的第二波生成 (SHG),为先进的光学应用提供了途径.

科学领域:

光学和光子学在光学和光子学.
材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学

背景情况:

单层过渡金属二甲基化物 (TMDs) 与连续体中的边界状态 (BICs) 相结合,显示出对高第二产生 (SHG) 的希望.
表面放置单层TMD中的弱激子-光子合限制了SHG的效率.
在使用BIC启发的结构的少数层TMD中实现SHG是一个重大挑战.

研究的目的:

报告一个新的基于BIC的超表面,使用少数层的TMD.
调查这些BIC的可性和环境稳定性.
在少数层TMD元表面中实现和量化高第二波生成 (SHG) 效率.

主要方法:

制造支持BIC的少数层TMD元表面.
描述BIC质量因子 (Q-因子) 和不同元原子厚度的可调性.
在BIC波长周围计算SHG效率.

主要成果:

超表面支持具有高Q因子的BIC,可根据超原子厚度调节,并且在各种环境中稳定.
高次波生成 (SHG) 转换效率为1.47 × 10-4的高次波生成 (SHG) 转换效率是通过6μW的事件功率实现的.
开发的超表面是超薄的,适合各种线性和非线性光学应用.

结论:

带有BIC的少层TMD超表面为高效的非线性光学提供了一个有前途的平台.
这项工作为开发下一代后元表面提供了新的途径.
证明的可调性和稳固性对于实际设备实施至关重要.

关键词:

连续体中的边界状态.高Q的高-Q的时间.metasurface 地表的表面是什么第二个波的第二代波.过渡金属二甲基化物 (TMDs) 过渡金属二甲基化物

更多相关视频

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Fabricating van der Waals Heterostructures with Precise Rotational Alignment

Published on: July 5, 2019

相关概念视频

Standing Waves in a Cavity

Standing Waves in a Cavity

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:

Generating Electromagnetic Radiations

Generating Electromagnetic Radiations

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...

Van de Graaff Generator

Van de Graaff Generator

Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...