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相关概念视频

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...

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相关实验视频

Updated: Jun 19, 2026

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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缺陷进化的四极高阶拓纳米激光器.

Shengqun Guo1, Wendi Huang1, Feng Tian1

  • 1School of Microelectronics, South China University of Technology, Guangzhou, China.

Nature communications
|February 26, 2026
PubMed
概括

我们展示了光子四极管拓相被缺陷演化激活,使纳米级激光实现. 这项研究为光子设备中的拓光束限制和调制开辟了新的途径.

科学领域:

  • 拓式光子学 拓式光子学
  • 凝聚物质物理学 凝聚物质物理学
  • 纳米光子学 纳米光子学

背景情况:

  • 高级拓绝缘体是拓光子学的一般化.
  • 它们可以在低维边界上强烈地限制光线.
  • 这促进了新的拓现象和纳米级光源.

研究的目的:

  • 为了揭示由缺陷演化激活的光子四极管拓相.
  • 为了在这个范式中演示纳米级激光操作.
  • 在光子学中探索拓相变的新路径.

主要方法:

  • 使用两个不同的光子晶片构建一个四极高阶拓纳米腔.
  • 在板块中设计出缺陷演变的相反方向.
  • 激光操作的实验演示.

主要成果:

  • 稳定的单模发射由缺陷演化的四极拓纳米激光器实现.
  • 在电信C频段观察到低激光值.
  • 室温操作已经证明.

结论:

  • 光子四极管拓相位过渡可以通过缺陷演化来激活.

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  • 这为拓光束限制和调制提供了一个有趣的路线.
  • 为拓驱动的纳米级光源提供了新的可能性.