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関連する概念動画

Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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First-Order Circuits01:15

First-Order Circuits

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First-order electrical circuits, which comprise resistors and a single energy storage element - either a capacitor or an inductor, are fundamental to many electronic systems. These circuits are governed by a first-order differential equation that describes the relationship between input and output signals.
One common example of a first-order circuit is the RC (resistor-capacitor) circuit. These circuits are used in relaxation oscillators such as neon lamp oscillator circuits. When voltage is...
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Switching of BJT01:22

Switching of BJT

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
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MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
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Directional Relays01:25

Directional Relays

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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Design Example: Forces in Sluice Gate01:11

Design Example: Forces in Sluice Gate

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In hydraulic engineering, sluice gates are essential for managing water flow through channels, reservoirs, and irrigation systems. Sluice gates, acting as vertical barriers, regulate water by adjusting the gate's opening height, which changes the velocity and pressure of water flowing beneath the gate. Understanding the forces involved is crucial to designing sluice gates that can withstand dynamic pressure differences, especially when the gate is closed or partially open.
Key variables in...
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関連する実験動画

Updated: May 5, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

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シングルゲート電気光学ビームスイッチングメタ表面

Sangjun Han1,2, Jinseok Kong1, Junho Choi3,4

  • 1School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea.

Light, science & applications
|August 26, 2025
PubMed
まとめ
この要約は機械生成です。

この研究では,グラフェンの単一ゲートバイアスによって制御される電気光学メタ表面を使用したアクティブビームスイッチング装置を導入します. 効率的で方向性のあるビームプロフィールを実現し,デバイスの操作を簡素化します.

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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関連する実験動画

Last Updated: May 5, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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科学分野:

  • フォトニクスとメタ素材
  • 光電子機器
  • ナノテクノロジー

背景:

  • 電気光学アクティブメタ表面は,光学波線の電子制御を提供します.
  • 伝統的なメタ表面には複雑なゲート配列が必要であり,光学効率が低い.

研究 の 目的:

  • 高光効率と大きな傾斜角度を持つ簡素化されたアクティブビームスイッチング装置を実証する.
  • メタ表面における光伝導性を調節するために単層グラフェンの使用を検討する.

主な方法:

  • デバイスの製造とアクティブなメタ表面の特徴付け
  • 遺伝子アルゴリズムを用いたキーパフォーマンスメトリック (絶対的および相対的効率) の最適化.
  • 非局所準正規モードの拡張に基づく分析フレームワークの開発.

主要な成果:

  • 高い絶対効率 (0.084 と 0.078) と相対効率 (0.765 と 0.836) を有する57°のアクティブビームスイッチングを達成した.
  • 屈折順に均一な光学効率を示した.
  • 分析モデリングを通じて 操作メカニズムに洞察を与えました

結論:

  • シングルゲートグラフェンベースのメタ表面は,効率的なアクティブビームスイッチングのための有望なプラットフォームを提供します.
  • シンプルなドライビングメカニズムは,以前のメタ表面設計の限界を克服します.
  • 現在の設計の性能の限界に対処することで,さらなる改善が可能である.