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関連する概念動画

Magnetic Vector Potential01:15

Magnetic Vector Potential

629
In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
629
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

3.5K
Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
3.5K
Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

4.1K
Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
4.1K
Carrier Transport01:21

Carrier Transport

444
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
444
Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

1.5K
In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
1.5K
Biot-Savart Law01:19

Biot-Savart Law

6.2K
The Biot-Savart law gives the magnitude and direction of the magnetic field produced by a current. This empirical law was named in honor of two scientists, Jean-Baptiste Biot and Félix Savart, who investigated the interaction between a straight, current-carrying wire and a permanent magnet.
A current-carrying wire creates a magnetic field in its vicinity. Consider an infinitesimal current element dl in a wire. The direction of vector dl is along the direction of the current. The total magnetic...
6.2K

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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
22:38

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

Published on: May 28, 2007

13.4K

光駆動ナノスケールベクトル電流

Jacob Pettine1, Prashant Padmanabhan2, Teng Shi2

  • 1Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, USA. jacob.pettine@lanl.gov.

Nature
|February 7, 2024
PubMed
まとめ
この要約は機械生成です。

科学者は新しいベクトル型光電子メタ表面を開発した. これらはナノスケールの電荷の流れを制御するために光パルスを使用し,マイクロエレクトロニクスと情報科学における新しいアプリケーションを可能にします.

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Last Updated: Jul 4, 2025

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
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Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

Published on: May 28, 2007

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Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
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科学分野:

  • 光電子機器
  • ナノテクノロジー
  • プラズモニック

背景:

  • 制御された電荷の流れは,エネルギー,情報転送,および探査材料の特性にとって極めて重要です.
  • 電流の光学制御は従来の電圧駆動システムに優位性がありますが,ナノスケールでの課題に直面しています.
  • 拡張可能な光電子システムは,ナノメートルスケールの電流の精密な光学操作を必要とする.

研究 の 目的:

  • ナノスケールの電荷の流れを光学的に制御するためのベクトル光電子メタ表面を導入する.
  • 調節可能で任意のパターンのローカルとグローバル電流を光を用いて実証する.
  • グラフェンなどの物質の 発光電荷のダイナミクスの 基礎物理学を探るためでした

主な方法:

  • 対称性破裂したプラズモンのナノ構造を持つベクトル形光電子メタ表面の製造.
  • 超高速光パルスによるナノ構造の刺激
  • ポラライゼーションに依存し,波長に敏感な電気読み出しとテラヘルツ (THz) 放射を用いた特徴付け.

主要な成果:

  • 局所的な指向性電荷の誘導をナノメートルのスケールで実証した.
  • ナノスケール電流の任意のパターンを達成しました.
  • ブロードバンドテラヘルツ (THz) のベクトルビームを,適正なグローバル電流で生成する.
  • グラフェンにおける電動力学,熱力学,水力学効果の複雑な相互作用を観察した.

結論:

  • ベクトル型光電子メタ表面は,ナノスケールの電流の汎用的な光学パターニングと制御を可能にします.
  • この発見は,材料診断,THz光譜,ナノマグネティズム,超高速情報処理の進歩に道を開きます.
  • この研究は,ナノスケールの光電子機器のための新しいパラダイムを確立します.