Probing the limits of plasmonic enhancement using a two-dimensional atomic crystal probe.

ABSTRACT: Achieving larger electromagnetic enhancement using a nanogap between neighboring metallic nanostructures has been long pursued for boosting light-matter interactions. However, the quantitative probing of this enhancement is hindered by the lack of a reliable experimental method for measuring the local fields within a subnanometer gap. Here, we use layered MoS₂ as a two-dimensional atomic crystal probe in nanoparticle-on-mirror nanoantennas to measure the plasmonic enhancement in the gap by quantitative surface-enhanced Raman scattering. Our designs ensure that the probe filled in the gap has a well-defined lattice orientation and thickness, enabling independent extraction of the anisotropic field enhancements. We find that the field enhancement can be safely described by pure cl

SUBMITTER: Chen W 

PROVIDER: S-EPMC6113320 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature