Active Control of Plasmon–Exciton Coupling in MoS₂–Ag Hybrid Nanostructures

Abstract

authors contributed equally to this work. Molybdenum disulfide (MoS 2 ) monolayers have attracted much attention for their novel optical properties and efficient light-matter interactions. When excited by incident laser, the optical response of MoS 2 monolayers was effectively modified by elementary photo-excited excitons owing to their large exciton binding energy, which can be facilitated for the optical-controllable exciton-plasmon interactions. Inspired by this concept, we experimentally investigated active light control of surface plasmon resonance (SPR) in MoS 2 -Ag hybrid nanostructures. The white light spectra of SPR were gradually red-shifted by increasing laser power, which was distinctly different from the one of bare Ag nanostructure. This spectroscopic tunability can be further controlled by near-field coupling strength and polarization state of light, and selectively

Recent Progress on Localized Field Enhanced Two‐dimensional Material Photodetectors from Ultraviolet—Visible to Infrared

“…According to additional simulations of the optical field distribution, the light is trapped near the Au nanoplate and a highly concentrated electrical field component is distributed near the MoS 2 surface, which leads to a stronger light‐MoS 2 interaction. More reported work with the similar principle, not only limited in 2D material system, also reveals the possibility of surface plasmon for enhancing optical absorption …”

Electron Energy Loss Spectroscopy of Hot Electron Transport between Gold Nanoantennas and Molybdenum Disulfide by Plasmon Excitation

“…Unique charge distributions between coupled nanoantennas permit indirect photon induction of dark modes, [46] which have been studied for silver quadrumers on MoS 2 . [47] Full width at half maximum (FWHM) of both modes were ≈1.3 eV on average.…”

“…[15] In another report, MoS 2 redshifted the bright plasmon resonance of 60 nm silver nanodisks by 36 meV, [47] less than the resolution of the GIF. Insertion of graphene beneath a Au nanoellipse also did not significantly change resonant plasmon energies in a previous report.…”

Strong Plasmon–Exciton Interactions on Nanoantenna Array–Monolayer WS2 Hybrid System

“…Different kinds of plasmonic systems have been explored for plasmon–exciton coupling with TMDs, including nanocavities, self‐assembled metallic nanoparticles, nanoantenna arrays, and metal nanohole arrays . For strong coupling, it is important to design plasmonic nanocavities with a mode field parallel to the transition dipole moment of the excitons in TMDs.…”