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相关概念视频

Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Reflection of Waves01:07

Reflection of Waves

When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
Basic Operations on Signals01:22

Basic Operations on Signals

Basic signal operations include time reversal, time scaling, time shifting, and amplitude transformations. These operations are fundamental in signal processing and analysis.
Time Reversal mirrors a continuous-time signal about the vertical axis at t=0. This is achieved by substituting t with −t. For example, if a signal x(t) is considered, the time-reversed signal is x(−t). This operation can be graphically represented, showing the mirrored signal.
Propagation of Waves01:07

Propagation of Waves

When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
Traveling Waves: Lossless Lines01:27

Traveling Waves: Lossless Lines

The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx and a shunt capacitance CΔx.

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相关实验视频

Updated: Jul 2, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

时间逆转和负折射.

J B Pendry1

  • 1Department of Physics, Blackett Laboratory, Imperial College London, London SW7 2AZ, UK. j.pendry@imperial.ac.uk

Science (New York, N.Y.)
|August 30, 2008
PubMed
概括
此摘要是机器生成的。

研究人员提出了一种新的负折射方法,使用频率过渡,使镜头具有亚波长分辨率. 这种技术适用于电磁波和声波,具有广泛的应用.

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
09:38

Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies

Published on: January 3, 2018

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Last Updated: Jul 2, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
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科学领域:

  • 物理 物理学 物理
  • 波浪现象是一种波浪现象.
  • 光学和声学学术的研究.

背景情况:

  • 负折射是一种波浪在相反的方向上曲的现象.
  • 时间逆转与负折射密切相关,这表明波浪操纵的潜在联系.

研究的目的:

  • 提出一个模拟界面负折射的方案.
  • 使用频率转换开发一种负折射镜头.
  • 探索电磁波和声波的应用.

主要方法:

  • 利用正和负频率之间的过渡来模拟负折射.
  • 开发适用于电磁波和声波的理论框架.
  • 提出一种负折射镜片的实验实现.

主要成果:

  • 展示了一个模仿负折射的理论方案.
  • 提出了一种能够负折射的透镜设计.
  • 突出了在理想条件下低波长分辨率的潜力.

结论:

  • 拟议的方案有效地通过频率转换模仿负折射.
  • 开发的镜头概念适用于电磁和声波现象.
  • 可实现子波长分辨率,但受到时间逆转信号强度的限制.