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関連する概念動画

Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Energy Losses in Transformers01:21

Energy Losses in Transformers

In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
There are four main reasons for energy losses in transformers.
The first cause can be  the high resistance of the copper windings...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
In a practical transformer, each winding exhibits resistance and leakage reactance. The winding...

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Updated: Jun 27, 2026

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
08:40

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Published on: April 28, 2014

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電気的に切り替える金属ポリマーナノアンテナ

Julian Karst1, Moritz Floess1, Monika Ubl1

  • 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.

Science (New York, N.Y.)
|October 28, 2021
PubMed
まとめ
この要約は機械生成です。

研究者は金属ポリマーを使って 切り替え可能なプラズモニックナノアンテナを開発しました これらの装置は,高度な光学アプリケーションの光物質相互作用の電気制御を可能にします.

さらに関連する動画

Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

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関連する実験動画

Last Updated: Jun 27, 2026

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules
08:40

Gyroid Nickel Nanostructures from Diblock Copolymer Supramolecules

Published on: April 28, 2014

12.6K
Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
08:07

Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates

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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

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科学分野:

  • プラズモニック
  • 材料科学
  • 光電子機器

背景:

  • 統合された電気光学活性プラズモニクスは,金属から断熱器への移行の電気スイッチングを必要とする.
  • プラズモンのナノアンテナはナノスケールで光を操作する上で重要な要素です.

研究 の 目的:

  • プラズモンのナノアンテナを 電気的なスイッチングが可能な金属ポリマーから実現する.
  • 高いコントラスト比を持つ電気的に切り替え可能なビーム・ステアリング・メタ表面を実証する.

主な方法:

  • 金属ポリマーを用いたプラズモンのナノアンテナの製造.
  • 光学的な金属から断熱器への移行の電気化学的駆動.
  • 局所的なプラズモンの共鳴の特徴と,その切り替えの行動.

主要な成果:

  • プラズモンのナノアンテナは金属状態で 顕著な局所的なプラズモンの共鳴を示した.
  • プラズモニック共鳴の電気スイッチング (オン/オフ) は,ビデオレート周波数 (最大30 Hz) で±1ボルトで達成されます.
  • 100%の伝送コントラスト比で,電気的に切り替え可能なビーム・ステアリング・メタ表面が実証されています.

結論:

  • 金属ポリマーベースのプラズモンのナノアンテナは,光学的性質の効率的な電気的な切り替えを可能にします.
  • このアプローチは,超高効率のプラズモニックベースのアクティブ光学的デバイスの開発を容易にする.
  • 潜在的応用には,高解像度の拡張現実と仮想現実の技術が含まれます.