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Compounding Plasmon–Exciton Strong Coupling System with Gold Nanofilm to Boost Rabi Splitting

1
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-sen University, Guangzhou 510275, China
2
School of Optoelectronic Engineering, Guang Dong Polytechnic Normal University, Guangzhou 510665, China
3
Institute of High Performance Computing, A*STAR (Agency for Science, Technology and Research), 1 Fusionopolis Way, Connexis, Singapore 138632, Singapore
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(4), 564; https://doi.org/10.3390/nano9040564
Received: 7 March 2019 / Revised: 3 April 2019 / Accepted: 4 April 2019 / Published: 7 April 2019
(This article belongs to the Special Issue Advances in Photonic and Plasmonic Nanomaterials)
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Abstract

Various plasmonic nanocavities possessing an extremely small mode volume have been developed and applied successfully in the study of strong light-matter coupling. Driven by the desire of constructing quantum networks and other functional quantum devices, a growing trend of strong coupling research is to explore the possibility of fabricating simple strong coupling nanosystems as the building blocks to construct complex systems or devices. Herein, we investigate such a nanocube-exciton building block (i.e. [email protected]), which is fabricated by coating Au nanocubes with excitonic J-aggregate molecules. The extinction spectra of [email protected] assembly, as well as the dark field scattering spectra of the individual nanocube-exciton, exhibit Rabi splitting of 100–140 meV, which signifies strong plasmon–exciton coupling. We further demonstrate the feasibility of constructing a more complex system of [email protected] on Au film, which achieves a much stronger coupling, with Rabi splitting of 377 meV. This work provides a practical pathway of building complex systems from building blocks, which are simple strong coupling systems, which lays the foundation for exploring further fundamental studies or inventing novel quantum devices. View Full-Text
Keywords: plasmonics; nanoparticles; plasmon–exciton strong coupling; nanoscale building block plasmonics; nanoparticles; plasmon–exciton strong coupling; nanoscale building block
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Song, T.; Chen, Z.; Zhang, W.; Lin, L.; Bao, Y.; Wu, L.; Zhou, Z.-K. Compounding Plasmon–Exciton Strong Coupling System with Gold Nanofilm to Boost Rabi Splitting. Nanomaterials 2019, 9, 564.

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