Nano-optical imaging of WSe2 waveguide modes revealing light-exciton interactions
arXiv:1601.02133 · doi:10.1103/PhysRevB.94.081402
Abstract
We report on nano-optical imaging study of WSe2 thin flakes with the scanning near-field optical microscopy (NSOM). The NSOM technique allows us to visualize in real space various waveguide photon modes inside WSe2. By tuning the excitation laser energy, we are able to map the entire dispersion of these waveguide modes both above and below the A exciton energy of WSe2. We found that all the modes interact strongly with WSe2 excitons. The outcome of the interaction is that the observed waveguide modes shift to higher momenta right below the A exciton energy. At higher energies, on the other hand, these modes are strongly damped due to adjacent B excitons or band edge absorptions. The mode-shifting phenomena are consistent with polariton formation in WSe2.
19 pages, 12 figures
References in corpus (6)
- Valley polarization in MoS2 monolayers by optical pumping
- Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
- High Performance Single Layered WSe2 p-FETs with Chemically Doped Contacts
- Strong light-matter coupling in two-dimensional atomic crystals
- Probing Excitonic Dark States in Single-layer Tungsten Disulfide
- The optical near-field of an aperture tip
Cited by in corpus (15)
- Polaritons in layered 2D materials
- Imaging exciton-polariton transport in MoSe2 waveguides
- Tailoring topological transition of anisotropic polaritons by interface engineering in biaxial crystals
- Opportunities in Electrically Tunable 2D Materials Beyond Graphene: Recent Progress and Future Outlook
- Prediction of hyperbolic exciton-polaritons in monolayer black phosphorus
- Imaging the coherent propagation of collective modes in the excitonic insulator candidate TaNiSe at room temperature
- Near-field Surface Waves in Few-Layer MoS2
- Tunable plasmonic reflection by bound 1D electron states in a 2D Dirac metal
- Strong light-matter coupling in MoS
- Deep learning analysis of polaritonic waves images
- Direct Nano-Imaging of Light-Matter Interactions in Nanoscale Excitonic Emitters
- Cavity exciton-polaritons in two-dimensional semiconductors from first principles
- Single-molecule-resolution ultrafast near-field optical microscopy via plasmon lifetime extension
- Photoemission electron microscopy of exciton-polaritons in thin WSe waveguides
- Polariton Waveguide Modes in Two-Dimensional Van der Waals Crystals: An Analytical Model and Correlative Scanning Near-Field Optical Microscopy Studies