  The plasmon-mediated manipulation of light-matter interaction in
two-dimensional atomically transition-metal dichalcogenides (TMDs) critically
depends on the design of plasmonic nanostructures to achieve the maximum
optical field in TMDs. Here, a metal-isolator-metal Salisbury-type perfect
absorber was fabricated to serve as a generator of the localized surface
plasmons. The significant photoluminescence (PL) enhancement up to 60-fold was
observed experimentally in the monolayer (ML) MoS2 on the top of this gold
plasmonic hybrid nanostructures. Furthermore, the PL linear polarization can
approach ~60 % around the peak of exciton emission and is independent on the
polarization of the excitation laser. This Salisbury-type plasmon-exciton
hybrid system paves a new way to develop optoelectronic devices based on TMDs.
