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相关概念视频

Determination of Crystal Structures01:29

Determination of Crystal Structures

113
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
113

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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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负折射由滑动反射对称晶体接口指导.

Yuzhong Zhou1, Tian Sang1, Yueke Wang1

  • 1Optoelectronic Engineering and Technology Research Center, Jiangnan University, Wuxi 214122, China.

Materials (Basel, Switzerland)
|March 27, 2025
PubMed
概括

这项研究引入了滑翔反射 (GR) 对称的音声晶体 (PC) 来实现超高分辨率声学镜片的负折射. 研究表明,在新型PC设计中,使用合边缘状态 (CES) 提高了负声折射.

科学领域:

  • 声学 声学 在声学方面
  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 材料科学 材料科学

背景情况:

  • 具有负折射率的声波晶体 (PC) 是超高分辨率声学镜头的关键.
  • 在声学系统中实现负折射是一个活跃的研究领域.

研究的目的:

  • 为了呈现一个新的滑动反射 (GR) 对称的音声晶体 (PC) 设计.
  • 用边缘状态 (ESs) 和合边缘状态 (CESs) 来证明负折射.
  • 为设计声学负折射装置提供一种新方法.

主要方法:

  • GR对称音声晶体的设计.
  • 通过万尼尔中心不匹配激发边缘状态 (ESs).
  • 堆叠GR对称PC接口以形成合边缘状态 (CES).
  • 有限元素方法 (FEM) 模拟用于验证.

主要成果:

  • 由于GR对称PC中的Wannier中心不匹配,ESs的出现.
  • 通过激发具有负分散的ESs来实现负折射.
  • 从相邻的GR对称PC接口之间的合观察CES.
  • 通过CESs表现出更强的负声折射与负横移.
关键词:
滑翔-反射对称性 滑翔-反射对称性有负折射的阴性折射.语音晶体的声音.

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Microfluidic Chips for In Situ Crystal X-ray Diffraction and In Situ Dynamic Light Scattering for Serial Crystallography
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结论:

  • 拟议的GR对称PC结构有效实现负折射.
  • 合边缘状态 (CES) 增强了负声折射效应.
  • 这项工作为设计声学负折射和超高分辨率声学镜片提供了一种新的方法.