Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

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
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
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
Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

3.2K
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.
3.2K
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

817
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,...
817
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

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

A high-throughput platform for single-molecule tracking identifies drug interaction and cellular mechanisms.

eLife·2025
Same author

Exposure to static magnetic field facilitates selective attention and neuroplasticity in rats.

Brain research bulletin·2022
Same author

Bayesian optimization to design a novel x-ray shaping device.

Medical physics·2022
Same author

Electrostatic tapering for efficient generation of radiation.

Physical review. E·2022
Same author

Turn-key constrained parameter space exploration for particle accelerators using Bayesian active learning.

Nature communications·2021
Same author

Frequency-domain calculation of Smith-Purcell radiation for metallic and dielectric gratings.

Applied optics·2020

Related Experiment Video

Updated: Feb 19, 2026

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices
09:26

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices

Published on: June 26, 2015

9.3K

Critical phenomenon in tapered dielectric structures.

Adi Hanuka, Levi Schächter

    Optics Letters
    |November 1, 2017
    PubMed
    Summary

    A critical behavior in tapered dielectric structures was discovered. Near a critical phase velocity, radiation escapes the structure, indicating a loss of confinement.

    Area of Science:

    • Electromagnetism
    • Photonics
    • Materials Science

    Background:

    • Dielectric structures are crucial for guiding electromagnetic waves.
    • Tapered structures offer unique wave manipulation capabilities.
    • Understanding wave confinement is essential for optical device design.

    Purpose of the Study:

    • To investigate the behavior of electromagnetic modes in tapered dielectric structures.
    • To identify critical phenomena associated with adiabatic tapering.
    • To understand the conditions under which radiation confinement fails.

    Main Methods:

    • Theoretical analysis of electromagnetic mode propagation.
    • Modeling of wave behavior in adiabatically tapered dielectric waveguides.
    • Numerical simulations to verify theoretical predictions.

    More Related Videos

    Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
    09:39

    Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

    Published on: June 28, 2024

    1.6K
    Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
    10:35

    Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

    Published on: September 26, 2014

    12.8K

    Related Experiment Videos

    Last Updated: Feb 19, 2026

    In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices
    09:26

    In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices

    Published on: June 26, 2015

    9.3K
    Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
    09:39

    Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

    Published on: June 28, 2024

    1.6K
    Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
    10:35

    Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

    Published on: September 26, 2014

    12.8K

    Main Results:

    • Demonstrated the existence of a critical behavior for electromagnetic modes.
    • Identified a critical phase velocity governing this behavior.
    • Observed significant transverse power escape when near the critical phase velocity.

    Conclusions:

    • Adiabatic tapering in dielectric structures exhibits critical behavior.
    • A critical phase velocity marks a transition point for radiation confinement.
    • Tapered dielectric structures can lead to unintended radiation loss.