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関連する概念動画

Electromagnetic Waves in Matter01:30

Electromagnetic Waves in Matter

Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium, μ.
Furthermore, the...
Dual Nature of Electromagnetic (EM) Radiation01:10

Dual Nature of Electromagnetic (EM) Radiation

Electromagnetic (EM) radiation consists of electric and magnetic field components oscillating in planes perpendicular to each other and mutually perpendicular to radiation propagation through space. EM radiation can be classified as a wave, characterized by the properties of waves such as wavelength (denoted as λ) and frequency (represented by ν).
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the number of...
Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Diamagnetism01:26

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Electromagnetic Waves01:30

Electromagnetic Waves

James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws of electricity and...
Standing Electromagnetic Waves01:15

Standing Electromagnetic Waves

Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...

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Updated: Jun 20, 2026

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

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

メモリメタマテリアル

T Driscoll1, Hyun-Tak Kim, Byung-Gyu Chae

  • 1Department of Physics, University of California at San Diego (UCSD), La Jolla, CA 92093, USA. tdriscol@physics.ucsd.edu

Science (New York, N.Y.)
|August 22, 2009
PubMed
まとめ
この要約は機械生成です。

研究者らは,持続的なチューニング能力を持つ周波数敏捷なメタマテリアルを開発した. このブレークスルーにより,記憶装置とインタフェースする,一時的な刺激を用いたメタマテリアルの反応に恒久的な変化がもたらされます.

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Fabricating Metamaterials Using the Fiber Drawing Method
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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

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関連する実験動画

Last Updated: Jun 20, 2026

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

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Fabricating Metamaterials Using the Fiber Drawing Method
11:57

Fabricating Metamaterials Using the Fiber Drawing Method

Published on: October 18, 2012

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
09:39

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

科学分野:

  • メタマテリアル 科学 科学 メタマテリアル
  • 凝縮物質物理学 凝縮物質物理学
  • 電気工学 電気工学とは

背景:

  • メタマテリアルは共振元素によりユニークな性質を有しているが,狭い利用可能な周波数帯域幅によって制限されている.
  • 周波数敏捷なメタマテリアルは,帯域幅の制限を克服するためにリアルタイムチューニングを提供します.
  • メタマテリアルの性質を安定して長期にわたって制御するために,持続的なチューニングメカニズムが必要です.

研究 の 目的:

  • メタマテリアルの電気制御された持続周波数調節を実証するために.
  • メタマテリアルの統合とメモリデバイスのコンセプトを探求する.
  • 伝統的なメタマテリアルの固有の帯域幅の制限を克服するために.

主な方法:

  • 電気的に調節可能な共鳴要素を持つメタマテリアルの製造.
  • 調節のための一時的な電気的刺激の適用.
  • 刺激の前と後のメタマテリアルの周波数応答の特徴化.
  • 持続的な状態保持の実証.

主要な成果:

  • 電気制御によるメタマテリアルの応答の持続的な周波数調節を達成しました.
  • 調節効果は,刺激が除去された後も維持されていることが実証されました.
  • メタマテリアルシステム内のメモリ容量の形態を展示した.

結論:

  • 電気制御された持続周波数調節は,メタマテリアルで達成可能である.
  • この技術は,メタマテリアルの性質の持続的な修正を可能にします.
  • 開発されたシステムは,メタマテリアルをメモリデバイスとインタフェースし,新しいアプリケーションの道を開きます.