Journal
NANO LETTERS
Volume 12, Issue 12, Pages 6152-6157Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3029784
Keywords
Localized surface plasmons; strong coupling; ZnO quantum wells; nanophotonics
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Funding
- US Department of Energy, Office of Science [DE-FG02-01ER45916]
- Vanderbilt IGERT Fellowship [DMR0333392]
- National Science Foundation [DMR-0804385]
- IC postdoctoral fellowship at Oak Ridge National Laboratory
- U.S. Department of Energy [DE-AC05-00OR22725]
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We demonstrate the formation of a hybridized plasmon exciton state exhibiting strong exciton plasmon coupling in ZnO/Zn0.85Mg0.15O single quantum wells capped with arrays of Al nanodiscs. Tuning the quantum-well width and the diameter and pitch of the Al nanodisc arrays facilitates a transition from the weak-coupling regime into the strong coupling regime. Finite-difference time-domain simulations substantiate the localization of the plasmonic quadrupole moment within the ZnO quantum-well layer, resulting in a hybridized plasmonexciton state demonstrating a Rabi splitting of roughly 15 meV in heterostructures that exhibit a prominent plasmon quadrupole mode. The significant tunability offered by quantum-well heterostructures like those discussed here provides a flexible system for controlling exciton plasmon coupling in a device-compatible thin-film architecture.
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