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関連する概念動画

Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

2.1K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
2.1K
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

5.4K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
5.4K
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

944
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
944
Gauss's Law in Dielectrics01:17

Gauss's Law in Dielectrics

5.8K
Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
5.8K
Electromagnetic Waves in Matter01:30

Electromagnetic Waves in Matter

2.8K
Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium,...
2.8K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.9K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.9K

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関連する実験動画

Updated: Apr 26, 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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ダイエレクトリック・グラデント・メタス表面光学要素

Dianmin Lin1, Pengyu Fan1, Erez Hasman2

  • 1Geballe Laboratory for Advanced Materials, Stanford University, 476 Lomita Mall, Stanford, CA 94305, USA.

Science (New York, N.Y.)
|July 19, 2014
PubMed
まとめ
この要約は機械生成です。

研究者らは,伝送モードでの効率的な光操作のための新しい介電梯度メタ表面を開発しました. これらのシリコンベースの光学エレメントは,高性能で,電子統合の可能性を備えています.

さらに関連する動画

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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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Published on: July 18, 2015

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関連する実験動画

Last Updated: Apr 26, 2026

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

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

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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

Published on: September 25, 2020

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Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
12:08

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

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科学分野:

  • 光学とフォトニック
  • 材料科学 材料科学とは
  • ナノテクノロジー ナノテクノロジー

背景:

  • 梯度メタ表面は,2Dの光学要素で,局所的な空間変数相変化を通じて光を制御します.
  • 以前のメタサーフェスはナノ金属アンテナを使用し,主に反射モードで高効率を達成しました.
  • 可視スペクトルのアプリケーションでは,伝送モードの効率化に制限がありました.

研究 の 目的:

  • ダイエレクトリック・グラデント・メタス表面光学要素を実験的に実現し,実証する.
  • 可視スペクトル内の伝送モードで高い difraktion 効率を達成するために.
  • より広範なメタ表面適用性と統合のために半導体の使用を検討する.

主な方法:

  • 100ナノメートルの厚さのシリコン (Si) 層を使用して超薄の介電メタ表面の製造.
  • Siのナノビームアンテナの密集した配置にSi層をパターニングする.
  • 伝送モードにおける光学要素の性能の特徴.

主要な成果:

  • 伝送モードでの介電グラデントメタ表面の高 difraktion 効率が実証されています.
  • 超薄格子,レンズ,アクシコンを成功裏に実現しました.
  • 可視光操作のためのシリコンベースのメタ表面の潜在能力を示しました.

結論:

  • 介電グラデントメタ表面は,以前の制限を克服し,伝送モードで高効率を提供します.
  • シリコンナノビームアンテナは,格子,レンズ,アクシコンなどの汎用的な光学要素の製造を可能にします.
  • 半導体ベースのメタ表面は,将来の光学および電子統合デバイスにとって有望である.