Fig. 1: Probing directional plasmonic enhancements using a two-dimensional atomic crystal probe.
From: Probing the limits of plasmonic enhancement using a two-dimensional atomic crystal probe
a 3D schematic of different number of layers MoS2 spaced NPOMs. b, c Schematic (b) and high-resolution TEM (c) images of a 1L MoS2-NPOM cross-section in its nanocavity region. The inset in c shows the enlarged image of the marked area (red square). Scale bars in c and in its inset are 10 nm and 1 nm. d Atomic displacements of the A1g and \({\mathrm{E}}_{2{\mathrm{g}}}^1\) modes in the unit cell of 1 L MoS2. e Raman scattering spectra of a 32-nm-thick Al2O3 coated 1 L MoS2-NPOM, a 1 L MoS2 on ultrasmooth gold film and on quartz, respectively. The inset shows the Raman imaging at 396 ± 10 cm−1, scale bar, 2 μm. f Normalized spectra taken from the black dot region in d, including the Lorentz fitting
