Strong Coupling of Plasmonic Nanorods with a MoSe₂ Monolayer in the Near-Infrared Shortwave Region

Abstract

Strong room-temperature light−matter coupling between quantum emitters and plasmonic nanoparticles is a central issue in nanophotonics. However, few studies have reported on the coherent states in the near-infrared shortwave region (NIR-I). In this study, a hybrid system composed of a single gold nanorod (Au NR) and a MoSe 2 monolayer was constructed. By tuning the length-to-diameter ratio of the single-anisotropy Au NR to match the exciton energy of MoSe 2 at 1.57 eV (791 nm), Rabi splitting of up to 75 meV was obtained via the dark-field scattering spectrum. Moreover, theoretical calculations using the finite-difference time-domain method were obtained and found to correspond with the experimental spectral results. This is attributed to the mode volume reduction and localized electric field distribution at the NIR-I resonance peak. These results facilitate obtaining and manipulating strong room-temperature light− matter couplings in the NIR-I region.

Temperature Effects on Hybrid of Ag Nanoparticles and Monolayer MoS2 for Surface-Enhanced Raman Spectroscopy

“…Transition metal dichalcogenides (TMDs), as 2D layered materials, have garnered significant interest because of their distinct optical and electrical properties. − Molybdenum disulfide (MoS 2 ), as a member of the TMDs family, demonstrates excellent performance in enhancing SERS activity due to its high transmittance and CM properties. − Numerous studies have highlighted the advantages of MoS 2 -based metals in SERS enhancement. First, MoS 2 has a large surface area, effectively enhancing the Raman signal of the detected molecules.…”