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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Coupling-based Huygens' meta-atom utilizing bilayer complementary plasmonic structure for light manipulation.

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    Researchers developed a novel Huygens

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    Area of Science:

    • Plasmonics and Nanophotonics
    • Metamaterial research
    • Optical engineering

    Background:

    • Huygens' meta-atoms are fundamental for metasurfaces, enabling precise wavefront control.
    • Existing methods for wavefront shaping often require complex antenna designs or material changes.

    Purpose of the Study:

    • To introduce a new Huygens' meta-atom design based on coupled nanodisk and nanohole structures.
    • To analyze the coupling effects and resonance characteristics of this novel meta-atom using an optical lumped nanocircuit model.
    • To demonstrate wavefront shaping capabilities by tuning the coupling through lateral misalignment.

    Main Methods:

    • Fabrication of a coupled nanodisk-nanohole structure.
    • Development of an optical lumped nanocircuit model for analyzing coupling effects.
    • Numerical simulations to investigate resonance frequencies and coupling mechanisms.
    • Design and simulation of gradient metasurfaces (reflective and transmissive) based on the coupled meta-atom.

    Main Results:

    • The coupled nanodisk-nanohole structure functions as a tunable Huygens' meta-atom.
    • Lateral misalignment effectively tunes the coupling, enabling wavefront shaping without altering structural dimensions.
    • Demonstrated design of a reflective gradient metasurface using a single coupled mode.
    • Achieved high-efficiency beam deflection with a transmissive gradient metasurface operating in the spectral overlap of electric and magnetic resonances.

    Conclusions:

    • The proposed coupling-based Huygens' meta-atom offers a new paradigm for plasmonic metasurface design.
    • This approach enhances light-matter interactions and enables high-efficiency, arbitrary wavefront shaping across the electromagnetic spectrum.
    • The tunable coupling mechanism provides a versatile platform for advanced optical device development.