期刊
NANO LETTERS
卷 19, 期 6, 页码 3543-3547出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b00484
关键词
Transition metal dichalcogenides; surface plasmon polaritons; electrically tunable interaction; vacuum Rabi splitting
类别
资金
- DoD Vannevar Bush Faculty Fellowship [N00014-16-1-2825, N00014-18-1-2877]
- NSF [PHY-1506284]
- NSF CUA [PHY-1125846]
- AFOSR MURI [FA9550-17-1-0002]
- ARL [W911NF1520067]
- Gordon and Betty Moore Foundation [GBMF4543]
- ONR MURI [N00014-15-1-2761]
- Samsung Electronics
We realize a new electroplasmonic switch based upon electrically tunable exciton-plasmon interactions. The device consists of a hexagonal boron nitride (hBN)-encapsulated tungsten diselenide (WSe2) monolayer on top of a single-crystalline silver substrate. The ultrasmooth silver substrate serves a dual role as the medium to support surface plasmon polaritons (SPPs) and the bottom gate electrode to tune the WSe2 exciton energy and brightness through electrostatic doping. To enhance the exciton-plasmon coupling, we implement a plasmonic crystal cavity on top of the hBN/WSe2/hBN/Ag heterostructure with a quality factor reaching 550. The tight confinement of the SPPs in the plasmonic cavity enables strong coupling between excitons and SPPs when the WSe2 exciton absorption is resonant with the cavity mode, leading to a vacuum Rabi splitting of up to 18 meV. This strong coupling can also be switched off with the application of a modest gate voltage that increases the doping density in the monolayer. This demonstration paves the way for new plasmonic modulators and a general device architecture to enhance light-matter interactions between SPPs and various embedded emitters.
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