Colloidal Assembly of Au-Quantum Dot-Au Sandwiched Nanostructures with Strong Plasmon-Exciton Coupling
Autor: | Yi Luo, Ou Chen, Yongchen Wang, Muqiong Liu, Shengli Zou, Jing Zhao, Hua Zhu |
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Rok vydání: | 2020 |
Předmět: |
Mode volume
Materials science Nanostructure Condensed Matter::Other Scattering Exciton Physics::Optics Nanoparticle 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics 0104 chemical sciences Condensed Matter::Materials Science Coupling (physics) Quantum dot General Materials Science Physical and Theoretical Chemistry 0210 nano-technology Plasmon |
Zdroj: | The journal of physical chemistry letters. 11(7) |
ISSN: | 1948-7185 |
Popis: | Strong plasmon-exciton coupling could occur in hybrid metal-dye/semiconductor nanostructures, where the fast energy exchange between plasmons and excitons leads to two new eigenmodes of the system, known as Rabi splitting. In experiments, strongly coupled nanosystems are difficult to obtain because they require some strict conditions, such as low plasmonic damping, small plasmon mode volume, and good spectral overlap. This work demonstrates strongly coupled metal-semiconductor nanostructures can be constructed using colloidal assembly. Specifically, sandwiched Au-quantum dot-Au nanostructures were created through the assembly of Au nanoparticles and colloidal quantum dots (QDs). The sizes of the QDs and the assembly conditions were varied to control the mode volume of the plasmonic cavity formed between the two Au nanoparticles. With a decreased gap size, Rabi splitting was observed in both dark-field scattering and fluorescence spectra of single Au-QD-Au nanostructures. Theoretical simulations revealed that the strong coupling occurred between the excitons and the octupolar plasmon modes. |
Databáze: | OpenAIRE |
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