Two-photon photoemission spectroscopy for silver nanoparticles on a hydrogen-terminated Si(1Â 1Â 1) surface: Metal nanoparticle-enhanced photoemission

The near-field from LSPR of Ag NPs enhances the photoemission from the surface of H-Si(1 1 1): at low coverage of Ag NPs around 0.005 MLE, the photoemission from the H-Si(1 1 1) substrate is ∼2 × 102 times enhanced. Above 0.10 MLE, in contrast, the photoemission from Ag NPs themselves is observed.