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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Related Experiment Video

Updated: Jun 22, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
08:19

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

Highly efficient fluorescence of a fluorescing nanoparticle with a silver shell.

Xue-Wen Chen, Wallace C Choy, Sailing He

    Optics Express
    |June 24, 2009
    PubMed
    Summary

    Adding a silver nanoshell significantly boosts nanoparticle fluorescence efficiency by enhancing spontaneous emission (SE) rates and improving light out-coupling. This core-shell structure overcomes the low efficiency of bare nanoparticles.

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    Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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    Area of Science:

    • Nanophotonics
    • Quantum Optics
    • Materials Science

    Background:

    • Bare fluorescing nanoparticles exhibit slow spontaneous emission (SE) rates, leading to low fluorescence efficiency.
    • Understanding nanoparticle optical properties is crucial for applications in sensing and imaging.

    Purpose of the Study:

    • To rigorously analyze the SE rate and fluorescence efficiency of bare and silver nanoshell-encapsulated nanoparticles.
    • To investigate the impact of core-shell structure on optical properties, considering nonlocal effects.

    Main Methods:

    • Classical electromagnetic approach incorporating nonlocal effects of the silver nanoshell.
    • Systematic study of SE rate and fluorescence efficiency dependence on core-shell parameters.

    Main Results:

    • Bare nanoparticles show SE rates significantly lower than in infinite media, resulting in poor fluorescence.
    • Silver nanoshell encapsulation leads to highly efficient fluorescence via Purcell enhancement and improved out-coupling.
    • Optimal core-shell design is key for maximizing fluorescence efficiency.

    Conclusions:

    • Silver nanoshells can dramatically enhance nanoparticle fluorescence efficiency.
    • Fluorescence efficiency depends on both internal quantum yield and out-coupling efficiency, not solely SE rate.