Observational analysis shows Raman enhancement factors 5 to 10 times higher in nanocavity structures, indicating significant electromagnetic field confinement.
Nanostructures with plasmonic nanoantennae and plasmonic nanocavities can confine and enhance local electromagnetic fields, with Raman enhancement factors 5 to 10 times higher than that of the sample without these two effects.
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Liao et al. (2025) studied this question.
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