Journal
NANO LETTERS
Volume 11, Issue 2, Pages 338-342Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl102412h
Keywords
Midinfrared; plasmon; quantum dot; Rabi splitting; strong coupling; quantum cascade lasers
Categories
Funding
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences through the Energy Frontier Research Center (EFRC) for Solid-State Lighting Science
- U.S. Department of Energy [DE-AC04-94AL85000]
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We demonstrate strong coupling between a surface plasmon and intersublevel transitions in self-assembled InAs quantum dots. The surface plasmon mode exists at the interface between the semiconductor emitter structure and a periodic array of holes perforating a metallic Pd/Ge/Au film that also serves as the top electrical contact for the emitters. Spectrally, narrowed quantaum dot electroluminescence was observed for devices with varying subwavelength hole spacing. Devices designed for 9, 10, and 11 mu m wavelength emission also exhibit a significant spectral splitting. The association of the splitting with quantum-dot Rabi oscillation is consistent with results from a calculation of spontaneous emission from an interacting plasmonic field and quantum-dot ensemble. The fact that this Rabi oscillation can be observed in ark incoherently excited, highly inhomogeneously broadened system demonstrates the utility of intersublevel transition's in quantum dots for investigations of coherent transient and quantum coherence phenomena.
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