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Related Concept Videos

Energy In A Magnetic Field01:24

Energy In A Magnetic Field

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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
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Energy Associated With a Charge Distribution01:21

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The work done to bring a charge through a distance r is given by the potential difference between the initial and the final position. To assemble a collection of point charges, the total work done can be expressed in terms of the product of each pair of charges divided by their separation distance, defined with respect to a suitable origin. Solving this expression gives the energy stored in a point charge distribution.
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Electric Field of a Non Uniformly Charged Sphere01:22

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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Updated: Mar 3, 2026

Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
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Vortex energy flows generated by core-shell nanospheres.

Shih-Wen Chen, Jia-Han Li

    Optics Express
    |April 26, 2017
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    Summary
    This summary is machine-generated.

    Light interacting with dielectric core-gold shell nanospheres creates optical vortices and whirlpools. These phenomena depend on nanosphere properties and surrounding media, impacting energy flow.

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    Area of Science:

    • Nanophotonics and Plasmonics
    • Computational Electromagnetics

    Background:

    • Core-shell nanostructures, particularly dielectric-gold nanoshells, exhibit unique optical properties due to plasmonic effects.
    • Understanding light-matter interactions at the nanoscale is crucial for developing advanced optical devices.

    Purpose of the Study:

    • To investigate the optical phenomena, specifically optical vortices and whirlpools, generated by dielectric core-gold shell nanospheres.
    • To analyze the influence of nanosphere dimensions, radius ratios, dielectric functions, and surrounding media on these optical effects.
    • To explore the potential of nanoshell dimers in creating controlled optical vortices.

    Main Methods:

    • Utilized the finite-difference time-domain (FDTD) method for numerical simulations.
    • Systematically varied parameters such as radius ratios, dimensions, and dielectric functions of the nanospheres.
    • Analyzed absorption and scattering cross sections to correlate with vortex formation.

    Main Results:

    • Optical vortices were observed inside the dielectric core, with whirlpools forming around the gold shell.
    • Vortex formation was strongly correlated with regions of increased absorption cross section and reduced scattering cross section.
    • Nanoshell dimers were shown to generate two optical vortices with opposite polarities.
    • The dielectric function of the surrounding medium significantly influenced the energy flows.

    Conclusions:

    • Dielectric core-gold shell nanospheres are effective in generating controlled optical vortices and whirlpools.
    • The optical response and vortex characteristics can be tuned by manipulating nanosphere design and environmental conditions.
    • Nanoshell dimers offer a pathway for creating complex optical vortex patterns, with potential applications in optical manipulation and sensing.