Dark‐Exciton‐Mediated Fano Resonance from a Single Gold Nanostructure on Monolayer WS2 at Room Temperature
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 11, 2019
- Source ID
- 10.1002/smll.201900982
Entities
People
- Alex Krasnok
- Andrea Alù
- He Liu
- Jie Fang
- Leonardo Scarabelli
- Luis M. Liz‐marzán
- Mauricio Terrones
- Mingsong Wang
- Mingzu Liu
- Tianyi Zhang
- Yuebing Zheng
- Zilong Wu
Organizations
- Air Force Office of Scientific Research
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine
- City College of New York
- Ikerbasque
- National Science Foundation
- Office of Naval Research
- Pennsylvania State University
- Robert A. Welch Foundation
- University of California, Los Angeles
- University of Texas at Austin