AI Article Synopsis
- The study presents an analytic model that improves the understanding of Raman and fluorescence enhancement in molecules situated between two closely spaced gold nanospheres, taking into account higher-order modes along with the traditional dipolar mode.
- The model is validated by gap-dependent tip-enhanced Raman spectroscopy (TERS) experiments, which reveal varying trends of photoluminescence and Raman enhancement as the gap width decreases.
- A red-shift in the background spectra indicates greater coupling between the nanospheres, demonstrating how the model effectively explains the mechanisms at play in the TERS experimental observations.
Article Abstract
An analytic model is used to calculate the Raman and fluorescence enhancement of a molecule in between two closely spaced gold nanospheres. Instead of using the conventional approach that only the dipolar plasmonic mode is considered, we calculate the electric field enhancement in the nanometre sized gap, by taking account of the higher order modes in one gold sphere, which couples to the dipolar mode of the other sphere. The experimental confirmation is performed by gap-dependent tip-enhanced Raman spectroscopy (TERS) measurements. The photoluminescence and Raman enhancement are both observed with different growing trends as the gap width decreases. Red-shift of the background spectra is observed and implies the increasing coupling between the nanospheres. This analytic model is shown to be able to interpret the enhancement mechanisms underlying gap-dependent TERS experimental results.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11502108 | PMC |
| http://dx.doi.org/10.1515/nanoph-2023-0882 | DOI Listing |
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