Polarized resonant emission of monolayer WS2 coupled with plasmonic sawtooth nanoslit arrayHan, C. & Ye, J., 5-Feb-2020, In : Nature Communications. 11, 1, 9 p., 713.
Research output: Contribution to journal › Article › Academic › peer-review
Transition metal dichalcogenide (TMDC) monolayers have enabled important applications in light emitting devices and integrated nanophotonics because of the direct bandgap, spin-valley locking and highly tunable excitonic properties. Nevertheless, the photoluminescence polarization is almost random at room temperature due to the valley decoherence. Here, we show the room temperature control of the polarization states of the excitonic emission by integrating WS2 monolayers with a delicately designed metasurface, i.e. a silver sawtooth nanoslit array. The random polarization is transformed to linear when WS2 excitons couple with the anisotropic resonant transmission modes that arise from the surface plasmon resonance in the metallic nanostructure. The coupling is found to enhance the valley coherence that contributes to similar to 30% of the total linear dichroism. Further modulating the transmission modes by optimizing metasurfaces, the total linear dichroism of the plasmon-exciton hybrid system can approach 80%, which prompts the development of photonic devices based on TMDCs.
|Number of pages||9|
|Publication status||Published - 5-Feb-2020|
- FANO RESONANCE, MOS2, PHOTOLUMINESCENCE, NANOSTRUCTURES