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関連する概念動画

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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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

時間の逆転とマイナスの屈折.

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
まとめ
この要約は機械生成です。

研究者は,周波数移行を用いた負折射のための新しい方法を提案し,サブ波長の解像度を持つレンズを可能にします. この技術は,電磁波と音波の両方に適用され,幅広いアプリケーションを提供しています.

さらに関連する動画

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

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

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

関連する実験動画

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

Published on: December 27, 2012

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

科学分野:

  • 物理 物理学 物理学とは
  • 波の現象は波の現象である.
  • 光学と音響学について

背景:

  • ネガティブ・リフレクションは,波が通常とは反対方向に曲がる現象です.
  • 時間の逆転は負折射と密接に関連しており,波の操作の潜在的なリンクを示唆しています.

研究 の 目的:

  • インターフェースでの負屈折を模倣するスキームを提案する.
  • 周波数トランジションを使用して,負折射レンズを開発する.
  • 電磁波と音波の両方の応用を探求する.

主な方法:

  • 負の屈折をシミュレートするために,正の周波数と負の周波数の間の移行を利用する.
  • 電磁波と音波に適用できる理論的枠組みの開発.
  • 陰性折射レンズの実験的実現を提案する.

主要な成果:

  • ネガティブな屈折を模倣する理論的スキームを示した.
  • ネガティブ・リフレクションを可能にするレンズの設計を提案した.
  • 理想的な条件下でのサブ波長解像度の可能性を強調した.

結論:

  • 提案されたスキームは,周波数移行を通じて負屈折を効果的に模倣します.
  • 開発されたレンズコンセプトは,電磁波現象と音波現象の両方に適用できます.
  • 亜波長解像度は達成可能ですが,時間逆転信号の強さに制限されています.