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関連する概念動画

Modes of Standing Waves - I01:03

Modes of Standing Waves - I

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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Magnetic Field Due to Two Straight Wires01:18

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Second Uniqueness Theorem01:16

Second Uniqueness Theorem

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Consider a region consisting of several individual conductors with a definite charge density in the region between these conductors. The second uniqueness theorem states that if the total charge on each conductor and the charge density in the in-between region are known, then the electric field can be uniquely determined.
In contrast, consider that the electric field is non-unique and apply Gauss's law in divergence form in the region between the conductors and the integral form to the...
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Standing Electromagnetic Waves01:15

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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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Modes of Standing Waves: II01:04

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
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Superconductor01:24

Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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歪んだグラフェン・スーパーストラクチャの巨大第二ハーモニック世代への積み重ね工学

Ge Song1,2, Hao Hong3, Chaojie Ma3

  • 1Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.

Journal of the American Chemical Society
|December 28, 2024
PubMed
まとめ
この要約は機械生成です。

研究者らは,エンジニアリングのスタッキングにより,多層グラフェンで第2ハーモニック生成 (SHG) を強化した. この巨大なSHG反応は 先進的なナノフォトニック装置に 期待を寄せています

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科学分野:

  • 材料科学
  • 光学について
  • 凝縮物質物理学

背景:

  • グラフェンの非線形光学特性は ナノフォトニックデバイスにとって極めて重要です
  • 二次和音生成 (SHG) は,対称グラフェン構造では通常禁止されている.
  • グラフェンのSHGの強化は,ナノフォトニクスの実用的な応用に不可欠です.

研究 の 目的:

  • ツイストされた多層グラフェンの第2ハーモニック生成 (SHG) の性能を調査し,改善する.
  • 数層のグラフェンにおけるSHGの調節におけるスタッキングエンジニアリングの役割を調査する.
  • エンジニアリングされたグラフェン構造におけるSHG強度の有意な強化を証明する.

主な方法:

  • 多層グラフェン構造の製造と特徴付け
  • グラフェン層の配置を制御するためにスタッキング技術を使用します.
  • 1064 nmの刺激下での第二ハーモニック生成 (SHG) の強度の実験測定.

主要な成果:

  • 歪んだ多層グラフェン構造で巨大なSHGの強度を示した.
  • 観測されたSHG強度は,単層MoS2のほぼ10倍である.
  • 強化の鍵として,平面内および平面外SHG感受性の調節を特定しました.

結論:

  • スタッキングエンジニアリングは,グラフェンのSHGを強化するための簡単で効果的な方法を提供します.
  • ねじれた多層グラフェンは,以前に報告されたグラフェン構造と比較して優れたSHG性能を示す.
  • この発見は,グラフェンベースの第2ハーモニックナノフォトニック装置と2D材料SHGの研究の道を開く.