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Related Concept Videos

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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...
Gauss's Law: Cylindrical Symmetry01:20

Gauss's Law: Cylindrical Symmetry

A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
Spherical and Cylindrical Capacitor01:26

Spherical and Cylindrical Capacitor

A spherical capacitor consists of two concentric conducting spherical shells of radii R1 (inner shell) and R2 (outer shell). The shells have equal and opposite charges of +Q and −Q, respectively. For an isolated conducting spherical capacitor, the radius of the outer shell can be considered to be infinite.
Conventionally, considering the symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field, calculated by...
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...
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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,...
Electric Field of Parallel Conducting Plates01:16

Electric Field of Parallel Conducting Plates

Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
Consider a cross-section of a thin, infinite conducting plate having a positive charge. For such a large thin plate, as the thickness of the plate tends to zero, the positive charges lie on the plate's two large faces. Without an external electric field, the...

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Related Experiment Video

Updated: Jun 12, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Multiple scattering by two parallel dielectric cylinders.

T G Tsuei, P W Barber

    Applied Optics
    |June 12, 2010
    PubMed
    Summary
    This summary is machine-generated.

    The interaction between two parallel dielectric cylinders significantly alters light scattering, especially near resonance. Touching cylinders completely suppress localized resonance effects, impacting optical properties.

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    Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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    Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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    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

    Area of Science:

    • Electromagnetics and Optics
    • Computational Physics
    • Materials Science

    Background:

    • Understanding light scattering from dielectric structures is crucial for optical applications.
    • The behavior of multiple scattering from complex geometries, like parallel cylinders, is not fully characterized.
    • Morphology-dependent resonances (MDRs) in dielectric particles significantly influence their optical response.

    Purpose of the Study:

    • To analyze the multiple-scattering problem for two parallel infinite dielectric cylinders under plane wave illumination.
    • To investigate the coupling effects influenced by cylinder size, separation, and orientation.
    • To examine the impact of these parameters on internal and near-field intensity, particularly for morphology-dependent resonances.

    Main Methods:

    • Numerical solutions were employed to solve the multiple-scattering problem.
    • Calculations focused on plane wave illumination perpendicular to the cylinder axes.
    • Internal and near-field intensities were computed for different incidence angles (end-on and broadside).

    Main Results:

    • Significant coupling effects were observed, dependent on cylinder size, separation, and orientation relative to the incident wave.
    • The study quantified how these parameters modify the scattering pattern and field distribution.
    • For cylinders exhibiting morphology-dependent resonance (size parameter = 45.329), touching the cylinders completely damped the localized resonance effect.

    Conclusions:

    • The proximity and arrangement of parallel dielectric cylinders critically influence their light-scattering characteristics.
    • The phenomenon of morphology-dependent resonance can be suppressed by physical contact between closely spaced cylinders.
    • These findings are relevant for designing optical components and understanding light-matter interactions in structured dielectric materials.