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Related Concept Videos

Electric Field of a Charged Disk01:23

Electric Field of a Charged Disk

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...
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.
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...
Electric Field of Two Equal and Opposite Charges01:30

Electric Field of Two Equal and Opposite Charges

Atoms generally contain the same number of positively and negatively charged particles, protons, and electrons. Hence, they are electrically neutral. However, the centers of the positive and negative charges do not always coincide. In such a scenario, the electric field of an atom may not be zero.
A separation of the positive and negative charges can lead to a weak, remnant effect of the positive and negative charges. The expectation is that the more the distance between the positive and...

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Related Experiment Video

Updated: Jun 22, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators
07:51

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Published on: July 2, 2012

Electric field enhancement between two Si microdisks.

M M Sigalas, D A Fattal, R S Williams

    Optics Express
    |June 25, 2009
    PubMed
    Summary

    Researchers theoretically investigated electric field enhancement in silicon microdisk gaps. Decreasing the gap distance significantly boosts the electric field, achieving over 200x enhancement in dielectric structures.

    Area of Science:

    • Photonics and optical engineering
    • Dielectric nanophotonics
    • Computational electromagnetics

    Background:

    • Gap plasmons in metallic nanostructures enable strong light confinement.
    • Exploring similar field enhancement in dielectric systems is of significant interest.
    • Silicon microdisks offer a promising platform for dielectric optical devices.

    Purpose of the Study:

    • To theoretically investigate electric field enhancement in the gap between two silicon (Si) microdisks.
    • To quantify the relationship between gap distance and field enhancement.
    • To explore methods for maximizing field enhancement in dielectric structures.

    Main Methods:

    • Utilized the finite difference time domain (FDTD) method for theoretical analysis.
    • Simulated electromagnetic field distribution in the gap region.

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  • Investigated the effect of varying the distance between Si microdisks.

    • Main Results:

    • Electric field strength in the gap increases significantly as the distance between Si microdisks decreases.
    • Achieved field enhancement up to two orders of magnitude.
    • Demonstrated a maximum enhancement factor of 238 with a deep sub-wavelength mode volume by perturbing the microdisks.

    Conclusions:

    • Purely dielectric silicon microdisk structures can achieve substantial electric field enhancement.
    • This dielectric approach mimics the behavior of gap plasmons in metal nanoparticles.
    • Offers a pathway for novel dielectric optical devices with strong light-matter interactions.