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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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Related Experiment Video

Updated: Mar 25, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Enhancing one dimensional sensitivity with plasmonic coupling: erratum.

Samuel O'Mullane, Brennan Peterson, Joseph Race

    Optics Express
    |February 25, 2016
    PubMed
    Summary

    Converged rigorous coupled wave approximation (RCWA) simulations corrected plasmonic enhancement descriptions in ellipsometric test structures. This study presents accurate minima locations, resolving previous simulation inaccuracies.

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    Area of Science:

    • Plasmonics
    • Optical Metrology
    • Computational Electromagnetics

    Context:

    • Rigorous Coupled Wave Approximation (RCWA) simulations are crucial for optical metrology.
    • Previous simulations suffered from unconverged results, leading to inaccurate minima location descriptions.
    • Plasmonic enhancement is a key principle in advanced ellipsometric test structures.

    Purpose:

    • To present converged RCWA simulations.
    • To correct the description of minima locations in plasmonic enhancement.
    • To ensure accurate modeling of ellipsometric test structures.

    Summary:

    • This work provides corrected data from converged rigorous coupled wave approximation (RCWA) simulations.
    • The corrected simulations accurately describe the behavior of minima locations.
    • The fundamental principle of plasmonic enhancement in ellipsometric test structures is validated.

    Impact:

    • Ensures accurate theoretical predictions for plasmonic-enhanced ellipsometric sensors.
    • Improves the reliability of optical metrology using RCWA.
    • Facilitates the design and interpretation of experiments involving plasmonic nanostructures.