Back to Search
Start Over
Generation and Detection of Strain-Localized Excitons in WS 2 Monolayer by Plasmonic Metal Nanocrystals.
- Source :
-
ACS nano [ACS Nano] 2022 Jul 26; Vol. 16 (7), pp. 10647-10656. Date of Electronic Publication: 2022 Jul 11. - Publication Year :
- 2022
-
Abstract
- Excitons in a transition-metal dichalcogenide (TMDC) monolayer can be modulated through strain with spatial and spectral control, which offers opportunities for constructing quantum emitters for applications in on-chip quantum communication and information processing. Strain-localized excitons in TMDC monolayers have so far mainly been observed under cryogenic conditions because of their subwavelength emission area, low quantum yield, and thermal-fluctuation-induced delocalization. Herein, we demonstrate both generation and detection of strain-localized excitons in WS <subscript>2</subscript> monolayer through a simple plasmonic structure design, where WS <subscript>2</subscript> monolayer covers individual Au nanodisks or nanorods. Enhanced emission from the strain-localized excitons of the deformed WS <subscript>2</subscript> monolayer near the plasmonic hotspots is observed at room temperature with a photoluminescence energy redshift up to 200 meV. The emission intensity and peak energy of the strain-localized excitons can be adjusted by the nanodisk size. Furthermore, the excitation and emission polarization of the strain-localized excitons are modulated by anisotropic Au nanorods. Our results provide a promising strategy for constructing nonclassical integrated light sources, high-sensitivity strain sensors, or tunable nanolasers for future dense nanophotonic integrated circuits.
Details
- Language :
- English
- ISSN :
- 1936-086X
- Volume :
- 16
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- ACS nano
- Publication Type :
- Academic Journal
- Accession number :
- 35816169
- Full Text :
- https://doi.org/10.1021/acsnano.2c02300