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関連する概念動画

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

5.0K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
5.0K
Gauss's Law in Dielectrics01:17

Gauss's Law in Dielectrics

5.2K
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...
5.2K
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

6.1K
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...
6.1K
Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

2.9K
When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
2.9K
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

1.9K
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....
1.9K
Molecular Models02:00

Molecular Models

43.8K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
43.8K

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関連する実験動画

Updated: Feb 9, 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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ピクセル化された介電メタ表面によるイメージングベースの分子バーコード

Andreas Tittl1, Aleksandrs Leitis1, Mingkai Liu2

  • 1Institute of BioEngineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

Science (New York, N.Y.)
|June 9, 2018
PubMed
まとめ
この要約は機械生成です。

研究者は,中赤外線の分子指紋を検出するために,介電性メタ表面を用いた新しいナノフォトニックイメージング方法を開発しました. この技術は,スペクトロメトリーなしで,敏感な化学的識別と,表面に結合した分析物の組成分析を可能にします.

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Fabrication Process of Silicone-based Dielectric Elastomer Actuators

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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

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関連する実験動画

Last Updated: Feb 9, 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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Fabrication Process of Silicone-based Dielectric Elastomer Actuators
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科学分野:

  • ナノフォトニクス
  • メタ表面技術
  • スペクトロスコーピー

背景:

  • メタ表面は光に対する高度な制御を提供し,フラット光学とサブ波長フォーカスのアプリケーションを可能にします.
  • 中赤外線光譜は 分子指紋の化学的識別と分析に不可欠です

研究 の 目的:

  • 中赤外線の分子指紋を検出するためのイメージングベースのナノフォトニック方法を開発する.
  • メタ表面を用いた表面結合分析物の化学的識別と組成分析を可能にする.

主な方法:

  • 超鋭い共鳴が 離散周波数で調整された 二次元のピクセルの介電メタ表面を使用した
  • 複数のスペクトルポイントで 分子吸収シグネチャーを読み出すための画像技術を開発した.
  • 化学イメージングのためのバーコードのような空間吸収マップに変換したスペクトル情報.

主要な成果:

  • 高感度で生物学的,ポリマー,殺虫剤の分子指紋を成功裏に検出しました.
  • 表面結合分析剤の化学的識別と組成分析の能力を実証した.
  • スペクトロメトリー,周波数スキャン,または機械部品なしで吸収指紋の読み取りを達成しました.

結論:

  • 開発されたイメージングベースのナノフォトニック方法は,中赤外線スペクトロスコピーに敏感で汎用的なアプローチを提供します.
  • この技術は 微小化されたスペクトロスコーピーのデバイスを バイオセンシングと環境モニタリングの 応用に導くのです