Tunable Fano Resonance and Plasmon–Exciton Coupling in Single Au Nanotriangles on Monolayer WS2 at Room Temperature |
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| Authors: | Mingsong Wang Alex Krasnok Tianyi Zhang Leonardo Scarabelli He Liu Zilong Wu Luis M. Liz‐Marzán Mauricio Terrones Andrea Alù Yuebing Zheng |
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| Affiliation: | 1. Department of Mechanical Engineering, Materials Science and Engineering Program, Texas Materials Institute, The University of Texas at Austin, Austin, TX, USA;2. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX, USA;3. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA, USA;4. Bionanoplasmonics Laboratory, CIC biomaGUNE, Donostia‐San Sebastián, Spain;5. Department of Chemistry and Biochemistry, California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, USA;6. Department of Chemistry, The Pennsylvania State University, University Park, PA, USA;7. Ikerbasque, Basque Foundation for Science, Bilbao, Spain;8. Biomedical Research Networking Center in Bioengineering, Biomaterials, and Nanomedicine, CIBER‐BBN, Donostia‐San Sebastián, Spain;9. Department of Physics and Center for 2‐Dimensional and Layered Materials, The Pennsylvania State University, University Park, PA, USA;10. Department of Materials Science and Engineering & Chemical Engineering, Carlos III University of Madrid, Leganés, Madrid, Spain;11. IMDEA Materials Institute, Getafe, Madrid, Spain |
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| 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. |
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| Keywords: | Fano resonance monolayer WS2 plasmon– exciton coupling plasmonics Rabi splitting |
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