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相关概念视频

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

4.0K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
4.0K
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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相关实验视频

Updated: Jul 13, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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基于全介电BIC金属表面的相位探测传感器

Zhenchao Liu1,2, Tingbiao Guo1, Qin Tan1

  • 1Centre for Optical and Electromagnetic Research, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310058, People's Republic of China.

Nano letters
|October 11, 2023
PubMed
概括

这项研究引入了一种全介电超表面传感器,用于高度敏感的折射率检测. 它实现了记录阶段询问灵敏度,与金属基传感器竞争,用于痕迹检测.

关键词:
所有的介电变压器都进入了表面.连续体中的有限状态.具有高灵敏度的高灵敏度阶段审讯审讯审讯的阶段.折射率指数的折射率指数是什么传感器 传感器 传感器

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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科学领域:

  • 纳米光子学 纳米光子学
  • 地表表面技术的技术.
  • 生物感应是一种生物感应.

背景情况:

  • 全介电超表面比金属传感器具有潜在的优势,但面临性能限制.
  • 折射率传感对于各种应用至关重要,包括生物化学分析和环境监测.
  • 现有的传感器往往难以达到高灵敏度和优点.

研究的目的:

  • 为了展示一种新型的全介电超表面传感器,利用连续 (BIC) 中的绑定状态来增强折射率传感.
  • 为了实现高灵敏度和阶段审讯的优点.
  • 确定全介电超表面在高性能传感应用中的潜力.

主要方法:

  • 设计和制造一个采用BIC的全介电超表面.
  • 引入对称性破坏以增强超表面的Q因子.
  • 用相探测测试用折射率传感器测试金属表面的实验性表征.
  • 微流体集成用于精确的样本输送.

主要成果:

  • 为基于BIC的微流体传感芯片实现了1200的高Q因子.
  • 展示了一个折射率传感器,功率为418 RIU-1.1.
  • 测量了2.7 × 104 deg/RIU的记录阶段询问灵敏度.
  • 展示了全介电BIC传感器与金属基传感器 (如表面等离子体共振) 竞争的能力.

结论:

  • 全介电BIC超表面传感器实现了前所未有的相探询灵敏度,用于折射率检测.
  • 这项技术与传统的金属传感器的性能相美,为超高灵敏度应用开辟了新的途径.
  • 开发的传感器对生物化学分析和环境监测中的痕迹检测具有重大前景.