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Photoelectric Effect02:26

Photoelectric Effect

30.7K
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Motion Of A Charged Particle In A Magnetic Field01:22

Motion Of A Charged Particle In A Magnetic Field

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A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
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Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

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The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
The system's symmetry is in the cylindrical directions across the plane of the charge. As a result, the electric fields created by various surface charge elements nullify each other in the direction parallel to the surface. Thereby, the resulting electric field is perpendicular to the plane. Since the disk is...
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Fermi Level Dynamics01:12

Fermi Level Dynamics

1.1K
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
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関連する実験動画

Updated: May 5, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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光子チップベースの粒子加速における電子相空間制御

R Shiloh1, J Illmer2, T Chlouba3

  • 1Physics Department, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany. roy.shiloh@fau.de.

Nature
|September 23, 2021
PubMed
まとめ

研究者はナノフォトニクスを使って 精密で高エネルギー粒子加速器を 制御することを実証しました この突破は 科学と医学のために より小さく より手頃な価格の加速器の道を開きます

さらに関連する動画

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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関連する実験動画

Last Updated: May 5, 2026

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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科学分野:

  • 物理学
  • ナノテクノロジー
  • 粒子加速器

背景:

  • 粒子加速器は重要ですが サイズとコストによって制限されています
  • ナノフォトニクスは 粒子加速にレーザーを使って 加速器を小型化する方法を提供します
  • 高エネルギー加速のために長距離の電子ビームを制御することは依然として課題です.

研究 の 目的:

  • ナノフォトニック構造における複雑な電子相空間制御を実証する.
  • 高エネルギー加速のための最小損失の粒子束の輸送を可能にします.
  • チップベースの粒子加速器の開発を進める

主な方法:

  • シリコンベースの光学ナノ構造を225ナノメートルのチャネルで利用した.
  • 粒子加速のために実装された光学周波数
  • 粒子束の閉じ込めのための実験的に示された交互相焦点.

主要な成果:

  • 77.7マイクロメートルのナノ構造で 複雑な電子相空間制御を実現しました
  • 最低損失の粒子輸送のスキームである 交替相フォーカスを成功裏に実証した.
  • メガ電子ボルトの電子ビームを 光子チップで生成する可能性を示した

結論:

  • この作業により,ナノフォトニック構造内の光学周波数で精密な電子ビーム制御が可能になります.
  • この技術は,コンパクトで費用対効果の高い粒子加速器の開発に不可欠です.
  • 潜在的応用には,高度な放射線治療と新しいコンパクトな光源が含まれます.