Polarized Photoluminescence Enhancement of Monolayer MoS₂ Coupled with Plasmonic Salisbury-Type Absorber

The plasmon-mediated manipulation of light–matter interaction in 2D 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 is fabricated to serve as a generator of the localized surface plasmons. The significant photoluminescence (PL) enhancement up to 60-fold is observed experimentally in the monolayer 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.