Manipulation of Exciton Dynamics in Single-Layer WSe2 Using a Toroidal Dielectric Metasurface
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Kangwon National Univ., Chuncheon (Korea, Republic of); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Columbia Univ., New York, NY (United States)
- Univ. of Wisconsin, Madison, WI (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Recent advances in emerging atomically thin transition metal dichalcogenide semiconductors with strong light–matter interactions and tunable optical properties provide novel approaches for realizing new material functionalities. Coupling two-dimensional semiconductors with all-dielectric resonant nanostructures represents an especially attractive opportunity for manipulating optical properties in both the near-field and far-field regimes. In this work, by integrating single-layer WSe2 and titanium oxide (TiO2) dielectric metasurfaces with toroidal resonances, we realized robust exciton emission enhancement over 1 order of magnitude at both room and low temperatures. Furthermore, we could control exciton dynamics and annihilation by using temperature to tailor the spectral overlap of excitonic and toroidal resonances, allowing us to selectively enhance the Purcell effect. Our results provide rich physical insight into the strong light–matter interactions in single-layer TMDs coupled with toroidal dielectric metasurfaces, with important implications for optoelectronics and photonics applications.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE National Nuclear Security Administration (NNSA); National Research Foundation of Korea (NRF); National Science Foundation (NSF)
- Grant/Contract Number:
- 89233218CNA000001; SC0019443; NA0003525; NA0003960; NRF-2021R1C1C1010660; DMR-2011738; DMR-1747426
- OSTI ID:
- 1835808
- Report Number(s):
- LA-UR-21-29823
- Journal Information:
- Nano Letters, Vol. 21, Issue 23; ISSN 1530-6984
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Revealing the biexciton and trion-exciton complexes in BN encapsulated WSe2
Imaging propagative exciton polaritons in atomically thin waveguides