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Fig. 3 Calculated electric field distributions of Ag TNP dimers and monomer.
The electric field distributions of Ag TNP dimers for different values of R are shown in Fig. 3.
As shown in Fig. 1, the electric field distributions of Ag nanoparticle monomer and dimer on monolayer graphene film hybrid systems were calculated under the excitation wavelengths of 633, 2000, and 3000 nm, separately.
When R is large enough, the electric field distributions of Ag TNPs in the dimer are similar to that of the Ag TNP monomer as shown in Fig. 3h. Figure 3e g show that peak 2 can be attributed to the symmetric mode from the LSPR coupling interaction between Ag truncated nanoprisms in the dimer.
In order to understand the electromagnetic contributions to SERS enhancement, local electric field amplitudes of Ag nanodisks and Raman sombrero nanoparticles in air were modeled using three-dimensional finite-difference time-domain simulations.
The multiphonon Raman scattering of as-fabricated Ag-ZnO nestlike heterostructures is also largely enhanced by the strongly localized electromagnetic field of the Ag surface plasmon.
The enhancement effect of the surrounding electric field of the Ag TNP dimers weakens as R increases.
It is worth noting that because excitons were only located within the near field of the Ag-NPs' surface leading to resonant coupling.
Note that this wavelength is similar to the wavelength of the surface plasmonic field of individual Ag-nNDLs, which would enhance the signal-to-noise ratio of the gathered fluorescence from the QDs deposited on the Ag substrate.
