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Colloidal Assembly of Au-Quantum Dot-Au Sandwiched Nanostructures with Strong Plasmon-Exciton Coupling.

08:00 EDT 10th March 2020 | BioPortfolio

Summary of "Colloidal Assembly of Au-Quantum Dot-Au Sandwiched Nanostructures with Strong Plasmon-Exciton Coupling."

Strong coupling of plasmon and exciton could occur in a hybrid metal-dye/semiconductor structure, where the fast energy exchange between plasmons and excitons leads to two new eigenmodes of the system, known as Rabi splitting. Not only new optical features emerge from Rabi splitting, strong plasmon-exciton coupling has the potential to alter the chemical reaction pathways of molecules. However, strongly coupled nanosystems are difficult to obtain and they require some strict conditions, such as low damping of the plasmonic nanostructures, small plasmon mode volume, and good spectral overlap between plasmons and excitons. This work demonstrates strongly coupled hybrid metal-semiconductor nanostructures can be constructed using colloidal assembly method. Specifically, sandwiched Au-QD-Au nanostructures were created through the assembly of Au nanoparticles and colloidal quantum dots (QDs). The sizes of the QDs were varied to control the mode volume of the plasmonic cavity formed between the two Au nanoparticles, and thus to tune the coupling strength between Au nanoparticles and QDs. Electron microscopy studies were applied in conjunction with optical microscopy and spectroscopy to correlate the morphology of the hybrid Au-QD-Au structures with their optical properties. With decreased gap size between the Au nanoparticles, peak splitting was observed in both dark-field scattering and fluorescence spectra of the Au-QD-Au system, due to the strong coupling effect between Au nanoparticles and QDs. Theoretical simulations revealed that the strong coupling occurred between the exciton and the higher order plasmon modes.

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This article was published in the following journal.

Name: The journal of physical chemistry letters
ISSN: 1948-7185
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