Tunable Fano Resonance and Plasmon–Exciton Coupling in Single Au Nanotriangles on Monolayer WS2 at Room Temperature
Abstract
Tunable Fano resonances and plasmon–exciton coupling are demonstrated at room temperature in hybrid systems consisting of single plasmonic nanoparticles deposited on top of the transition metal dichalcogenide monolayers. By using single Au nanotriangles (AuNTs) on monolayer WS2 as model systems, Fano resonances are observed from the interference between a discrete exciton band of monolayer WS2 and a broadband plasmonic mode of single AuNTs. The Fano lineshape depends on the exciton binding energy and the localized surface plasmon resonance strength, which can be tuned by the dielectric constant of surrounding solvents and AuNT size, respectively. Moreover, a transition from weak to strong plasmon–exciton coupling with Rabi splitting energies of 100–340 meV is observed by rationally changing the surrounding solvents. With their tunable plasmon–exciton interactions, the proposed WS2–AuNT hybrids can open new pathways to develop active nanophotonic devices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 16, 2018
- Source ID
- 10.1002/adma.201705779
Entities
People
- Alex Krasnok
- Andrea Alù
- He Liu
- Leonardo Scarabelli
- Luis M. Liz‐marzán
- Mauricio Terrones
- Mingsong Wang
- Tianyi Zhang
- Yuebing Zheng
- Zilong Wu
Organizations
- Air Force Office of Scientific Research
- Army Research Office
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine
- Ikerbasque
- Ministry of Economy, Industry and Competitiveness
- National Science Foundation
- Office of Naval Research
- Pennsylvania State University
- Universidad Carlos III de Madrid
- University of California, Los Angeles
- University of Texas at Austin