通过超快速电子显微镜在实时空间和实时中解读奇拉超表面的光转换
Ling Tong1, Fei Xie2, Xiaochen Gao1
1The Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China.
Light, science & applications
|January 13, 2026
概括
研究人员使用光子诱导近场电子显微镜 (PINEM) 可视化了奇拉元表面的光转换. 他们揭示了几何设计如何影响纳米尺度的光学和能量消散途径.
科学领域:
- 纳米光子学 纳米光子学
- 螺旋形地表表面的表面.
- 光学奇拉性是指光学奇拉性.
背景情况:
- 状结构表现出光学活动 (循环二元化,CD),对于纳米级光学操纵至关重要.
- 奇拉结构中CD和局部几何学效应的微观起源缺乏足够的时空分辨率.
研究的目的:
- 为了揭开光的转换过程,在一个 Γ 形的奇拉性超表面.
- 为了将局部几何与光学力生成和能量消散相关联.
主要方法:
- 结合远场圆度测量与近场成像使用光子诱导近场电子显微镜 (PINEM) 在纳米-秒分辨率.
- 将近场分布分解成对称和不对称的组成部分.
- 使用有限元素模拟.
主要成果:
- 定义了一个近场圆性,它在数量上与远场圆性相匹配.
- 确定了在 Γ 形元原子的角落上的电偶极作为圆性的主要来源.
- 与对称相比,不对称的近距离场的消散速度较快 (几十到几百个femtosecond).
结论:
- 提供了微观的洞察力,以了解在性结构中的光转化.
- 证明了依赖于形几何学的能量消散路径.
- 奠定了设计先进的性光子设备的基础.
相关概念视频
01:15Transmission Electron Microscopy
6.8K
In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
6.8K
01:25Overview of Electron Microscopy
12.9K
The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
12.9K
01:07Electron Microscope Tomography and Single-particle Reconstruction
2.8K
Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
2.8K