journal article·2019-08Open access

Dark‐Exciton‐Mediated Fano Resonance from a Single Gold Nanostructure on Monolayer WS2 at Room Temperature

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

Small· Volume 15· Issue 31

Abstract

Abstract Strong spatial confinement and highly reduced dielectric screening provide monolayer transition metal dichalcogenides with strong many‐body effects, thereby possessing optically forbidden excitonic states (i.e., dark excitons) at room temperature. Herein, the interaction of surface plasmons with dark excitons in hybrid systems consisting of stacked gold nanotriangles and monolayer WS2 is explored. A narrow Fano resonance is observed when the hybrid system is surrounded by water, and the narrowing of the spectral Fano linewidth is attributed to the plasmon‐enhanced decay of dark K‐K excitons. These results reveal that dark excitons in monolayer WS2 can strongly modify Fano resonances in hybrid plasmon–exciton systems and can be harnessed for novel optical sensors and active nanophotonic devices.
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Research context

OpenAlex topics: 2D Materials and Applications · Plasmonic and Surface Plasmon Research · Gold and Silver Nanoparticles Synthesis and Applications

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

Affiliations

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

Photonics Initiative Advanced Science Research Center Physics Program Graduate Center Department of Electrical Engineering City College of the City University of New York New York NY 10031 USA

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

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

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

Ikerbasque Basque Foundation for Science 48013 Bilbao Spain

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

Funding

Office of Naval Research · National Science Foundation · Welch Foundation · Air Force Office of Scientific Research

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