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Related Concept Videos

Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Synthesis of Immunotargeted Magneto-plasmonic Nanoclusters
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Optomagnets in nonmagnetic plasmonic nanostructures.

Vage Karakhanyan, Yannick Lefier, Clément Eustache

    Optics Letters
    |February 2, 2021
    PubMed
    Summary

    Metallic nanostructures generate DC current loops via optical rectification, creating concentrated magnetic fields at corners. This plasmonic effect enables nanoscale magnetic field control for applications in sensing and spin wave generation.

    Area of Science:

    • Condensed matter physics
    • Plasmonics
    • Nanotechnology

    Background:

    • Plasmonic nanostructures exhibit unique optical properties.
    • Optical rectification can generate static electric fields from AC optical signals.
    • Spin-orbit interaction plays a role in electron dynamics.

    Purpose of the Study:

    • To theoretically investigate optically induced DC current loops in plasmonic nanostructures.
    • To understand the role of electromotive forces, including spin-orbit interaction, in generating these currents.
    • To explore the spatial distribution and concentration of static magnetic fields produced.

    Main Methods:

    • Simplified hydrodynamic model of a metal's free electron gas.
    • Theoretical analysis of optical rectification processes.

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  • Investigation of electromotive forces, including optical spin-orbit interaction.

    • Main Results:

    • Optically induced DC current loops were theoretically observed.
    • Static magnetic fields are maximally concentrated and confined at the corners of nanostructures.
    • Metallic discontinuities enhance magnetic field concentration and tailoring on the nanoscale.

    Conclusions:

    • Plasmonics can generate and tune static magnetic fields and forces at the nanoscale.
    • Potential applications include magnetic tweezing, sensing, magneto-optical effects, and spin wave generation.