title: Silver Nanoshell Plasmonically Controlled Emission of Semiconductor Quantum Dots in the Strong Coupling Regime.
abstract: Strong coupling between semiconductor excitons and localized surface plasmons (LSPs) giving rise to hybridized plexciton states in which energy is coherently and reversibly exchanged between the components is vital, especially in the area of quantum information processing from fundamental and practical points of view. Here, in photoluminescence spectra, rather than from common extinction or reflection measurements, we report on the direct observation of Rabi splitting of approximately 160 meV as an indication of strong coupling between excited states of CdSe/ZnS quantum dots (QDs) and LSP modes of silver nanoshells under nonresonant nanosecond pulsed laser excitation at room temperature. The strong coupling manifests itself as an anticrossing-like behavior of the two newly formed polaritons when tuning the silver nanoshell plasmon energies across the exciton line of the QDs. Further analysis substantiates the essentiality of high pump energy and collective strong coupling of many QDs with the radiative dipole mode of the metallic nanoparticles for the realization of strong coupling. Our finding opens up interesting directions for the investigation of strong coupling between LSPs and excitons from the perspective of radiative recombination under easily accessible experimental conditions.
authors.affiliation: State Key Laboratory of Silicon Materials and School of Materials Science and Engineering and ‡Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University , Hangzhou, Zhejiang 310027, People's Republic of China.
authors.forename: Ning
authors.initials: N
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Silicon Materials and School of Materials Science and Engineering and ‡Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University , Hangzhou, Zhejiang 310027, People's Republic of China.
authors.forename: Meng
authors.initials: M
authors.lastname: Yuan
authors.affiliation: State Key Laboratory of Silicon Materials and School of Materials Science and Engineering and ‡Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University , Hangzhou, Zhejiang 310027, People's Republic of China.
authors.forename: Yuhan
authors.initials: Y
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Silicon Materials and School of Materials Science and Engineering and ‡Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University , Hangzhou, Zhejiang 310027, People's Republic of China.
authors.forename: Dongsheng
authors.initials: D
authors.lastname: Li
authors.affiliation: State Key Laboratory of Silicon Materials and School of Materials Science and Engineering and ‡Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University , Hangzhou, Zhejiang 310027, People's Republic of China.
authors.forename: Deren
authors.initials: D
authors.lastname: Yang
keywords: Rabi splitting; localized surface plasmon; photoluminescence; plexciton; quantum dot; silver nanoshell; strong coupling