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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

23.8K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
23.8K
Standing Waves in a Cavity01:28

Standing 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

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相关实验视频

Updated: Jun 5, 2025

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

Published on: February 25, 2017

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光学定义的音声晶体缺陷

Thomas J Clark1, Simon Bernard1, Jiaxing Ma1

  • 1Department of Physics, <a href="https://ror.org/01pxwe438">McGill University</a>, Montréal, Québec H3A 2T8, Canada.

Physical review letters
|December 13, 2024
PubMed
概括
此摘要是机器生成的。

研究人员创建了一个机械晶体,由光控制的缺陷模式. 这种光学方法将机械振动限制在特定区域,增强频率转移并减少新型缺陷工程的有效质量.

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

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相关实验视频

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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科学领域:

  • 固态物理 固态物理
  • 材料科学是一种材料科学.
  • 纳米技术 纳米技术

背景情况:

  • 声波晶体可以控制机械振动.
  • 创建局部机械缺陷是一个挑战.
  • 光学控制提供了重新配置的可能性.

研究的目的:

  • 为了证明机械故障模式的全光学控制.
  • 在音声晶体内定位机械模式.
  • 为了实现机械故障的现场重新配置.

主要方法:

  • 使用光学弹来操纵声波晶体膜.
  • 将机械模式转移到晶体的带隙中.
  • 测量频率转移和有效质量变化.

主要成果:

  • 成功地在几个单元细胞内定位了一种机械模式.
  • 由于模式限制,观察到显著的频率转移.
  • 证明了该模式的参与质量减少了37倍.
  • 实现了快速和可逆的全光学控制.

结论:

  • 全光控制为工程机械缺陷提供了一种新方法.
  • 在机械故障的现场重新配置是可以实现的.
  • 这种技术为先进的机械系统提供了优势.