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相关概念视频

Induced Electric Dipoles01:28

Induced Electric Dipoles

A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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...
Gauss's Law in Dielectrics01:17

Gauss's Law in Dielectrics

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...
Induced Electric Fields01:23

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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.

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相关实验视频

Updated: May 8, 2026

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
08:32

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

Published on: January 29, 2013

在介电材料中的光场诱导电流.

Agustin Schiffrin1, Tim Paasch-Colberg, Nicholas Karpowicz

  • 1Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany. aschiffr@phas.ubc.ca

Nature
|December 11, 2012
PubMed
概括

研究人员在介电材料中展示了超快的电信号控制,这是以前认为不可能的壮举. 光学波形操纵的这一突破可以将电子信号处理推进到 petahertz 范围.

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相关实验视频

Last Updated: May 8, 2026

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
08:32

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors

Published on: January 29, 2013

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
10:03

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

Published on: September 30, 2014

Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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科学领域:

  • 固态物理 固态物理
  • 光电学是指光电子产品.
  • 材料科学 材料科学 材料科学

背景情况:

  • 当前的信号处理速度受到电流的切换时间的限制,通常在千兆赫兹范围内.
  • 太赫兹 (THz) 范围的信号处理受到电气互连和半导体现有的光学控制方法的限制所阻碍.
  • 介电材料不适合用于超快的光学电流控制,原因是紫外线的损伤或强电场的破坏.

研究的目的:

  • 通过光学波形来研究在介电材料内操纵电信号的可行性.
  • 克服现有的高频电流控制方法的局限性.
  • 探索介电物的潜力,将电子信号处理扩展到佩塔赫兹 (PHz) 域.

主要方法:

  • 利用几个循环的光学波形与无形二氧化 (化) 相互作用.
  • 研究了光学影响下介电体的交流电导率的变化.
  • 测量了导电性变化的时间尺度和控制电流的能力.

主要成果:

  • 在1 femtosecond内实现了无形二氧化的交流电导率可逆增加超过18个数量级.
  • 证明了使用瞬间光场驱动,引导和切换电流的能力,而不会引起故障.
  • 在介电材料中成功控制电信号,这与基于半导体的方法相比是显著的进步.

结论:

  • 在介电材料中的电信号操纵是可行的,使用量身定制的光学波形.
  • 这种技术克服了与用于超快光学控制的介电材料相关的先前限制.
  • 这些发现为将电子信号处理和高速计量技术扩展到佩塔赫兹 (10^15 Hz) 域铺平了道路.