journal article·2018-05

Tunable Fano Resonance and Plasmon–Exciton Coupling in Single Au Nanotriangles on Monolayer WS2 at Room Temperature

Mingsong Wang, Alex Krasnok, Tianyi Zhang, Leonardo Scarabelli, He Liu, Zilong Wu, Luis M. Liz‐Marzán, Mauricio Terrones, Andrea Alù, Yuebing Zheng

Advanced Materials· Volume 30· Issue 22
Publisher page

Abstract

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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Research context

OpenAlex topics: Plasmonic and Surface Plasmon Research · 2D Materials and Applications · Strong Light-Matter Interactions

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Mechanical Engineering Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA

Department of Electrical and Computer Engineering The University of Texas at Austin Austin TX 78712 USA

Department of Materials Science and Engineering The Pennsylvania State University University Park PA 16802 USA

Bionanoplasmonics Laboratory CIC biomaGUNE Paseo de Miramón 182 20014 Donostia‐San Sebastián Spain

Department of Chemistry and Biochemistry California NanoSystems Institute University of California Los Angeles, Los Angeles CA 90095 USA

Department of Chemistry The Pennsylvania State University University Park PA 16802 USA

Ikerbasque Basque Foundation for Science 48013 Bilbao Spain

Biomedical Research Networking Center in Bioengineering Biomaterials, and Nanomedicine CIBER‐BBN 20014 Donostia‐San Sebastián Spain

Department of Physics and Center for 2‐Dimensional and Layered Materials The Pennsylvania State University University Park PA 16802 USA

Department of Materials Science and Engineering & Chemical Engineering Carlos III University of Madrid Avenida Universidad 30 28911 Leganés Madrid Spain

IMDEA Materials Institute Eric Kandel 2 Getafe Madrid 28005 Spain

Funding

Office of Naval Research · National Science Foundation · Air Force Office of Scientific Research · Army Research Office · Ministerio de Economía y Competitividad

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