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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.
This article was published in the following journal.
Name: The journal of physical chemistry letters
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Nanometer sized fragments (the dots) of semiconductor crystalline material which emit PHOTONS. The wavelength is based on the quantum confinement size of the dot. They are brighter and more persistent than organic chemical INDICATORS. They can be embedded in MICROBEADS for high throughput ANALYTICAL CHEMISTRY.
A formulation for presenting an antigen to induce specific immunologic responses. It consists of an assembly of antigens in multimeric form. The assembly is attached to a matrix with a built-in adjuvant, saponin. ISCOMs induce strong serum antibody responses, and are used as highly immunogenic forms of subunit vaccines.
Materials which have structured components with at least one dimension in the range of 1 to 100 nanometers. These include NANOCOMPOSITES; NANOPARTICLES; NANOTUBES; and NANOWIRES.
A histone chaperone that facilitates nucleosome assembly by mediating the formation of the histone octamer and its transfer to DNA.
A family of cellular proteins that mediate the correct assembly or disassembly of polypeptides and their associated ligands. Although they take part in the assembly process, molecular chaperones are not components of the final structures.