Abstract
We investigated the grating effect in complex gold dolmen structures, in which multiple plasmon modes are present due to plasmon hybridization, experimentally from both the far field and the near field. In particular, the near-field properties were investigated using photoemission electron microscopy, and it was demonstrated that two hybridized plasmon modes on the dolmen structures could be influenced by the grating effect. For comparison, we also investigated the grating effect in arrays of simple nanoblocks and heptamer structures, which were supposed to support a strong bright plasmon mode and a strong dark plasmon mode, respectively, in the near field. We found that the spectral responses of the two hybridized modes on the dolmen structures as the pitch size changed evolved in a manner similar to that of the bright dipole mode on the nanoblocks, whereas the dark mode on the heptamer structures is less sensitive to the pitch size.
Highlights
Over the past few decades, localized surface plasmon resonances (LSPRs) supported on metallic nanoparticles (NPs) have attracted significant research interest due to their abundant optical properties and broad range of applications in various fields, including surfaceenhanced Raman scattering [1], sensing [2], plasmon-assisted photochemical reactions [3], photocurrent generation [4], and artificial photosynthesis [5, 6]
We investigated the grating effect in complex gold dolmen structures, in which multiple plasmon modes are present due to plasmon hybridization, experimentally from both the far field and the near field
The near-field properties were investigated using photoemission electron microscopy, and it was demonstrated that two hybridized plasmon modes on the dolmen structures could be influenced by the grating effect
Summary
Over the past few decades, localized surface plasmon resonances (LSPRs) supported on metallic nanoparticles (NPs) have attracted significant research interest due to their abundant optical properties and broad range of applications in various fields, including surfaceenhanced Raman scattering [1], sensing [2], plasmon-assisted photochemical reactions [3], photocurrent generation [4], and artificial photosynthesis [5, 6]. When the diffraction order is evanescent, that is, the diffracting light propagates along the plane of the array, the local optical fields in the plane become large resulted from an almost in-phase addition of the scattered light field of neighboring particles This can result in the shift of the plasmon resonance. Near-field measurements will provide new insights into plasmon coupling in complex metallic NP arrays, but they are still lacking Such near-field measurements of plasmonic nanostructures can be made using multiphoton photoemission electron microscopy (PEEM), which has been used to investigate the nearfield properties of simple NPs and complex aggregated nanostructures [24,25,26,27,28,29,30,31]
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