Strong coupling is a natural phenomenon that interacts in more than two systems. When strong coupling occurs, the characteristics of the system in certain aspects will be significantly different from the original characteristics. For example, the optical response, electrical response, and vibration response will all change significantly during strong coupling. Due to the lack of in-depth research on such phenomena at this stage, it is difficult for them to be fully applied in practical problems. However, many changes in material properties during the strong coupling phenomenon have great application potential. For example, there are studies showing that the strong coupling phenomenon can be used to modify the chemical reaction rate and fluorescence spectral characteristics of biotechnology materials to meet the required requirements .
The Remo research group of the Cixi Medical Institute affiliated to the Ningbo Institute of Materials Technology and Engineering of the Chinese Academy of Sciences has cooperated with the Italian Institute of Technology (IIT), Louisiana State University (USA) and Jilin University in China to change the J-polymer through research ( The composition of two parts) The effect of the concentration of one part on the phenomenon of strong coupling, in-depth understanding of the mechanism of strong coupling. Specifically, by following the static and dynamic research methods, the researchers obtained the optimal conditions for reaching the Rabi split (high coupling strength). The research results are of great significance to transform the strong coupling phenomenon from basic science to applied science, and provide guidance for subsequent research. In this study, the results obtained by the dynamic analysis method show that the establishment of a complete set of models that can predict the characteristics of such systems over time is essential for the application of strong coupling phenomena.
Figure 1 shows the strong coupling that occurs between nanostructured devices and J-polymer molecules. Figure 1 (left) is an SEM image of a nanostructured device. It can be seen that nanopores are regularly arranged on the surface of the gold plate (scale is 310 nm); the picture also contains a schematic diagram of the device, nanodevices and J-polymer molecules It has a similar wavelength response (about 630 nm); the change law of the absorption peak and absorption peak intensity of J-polymer with concentration is that the peak position is around 630 nm, and the absorption peak intensity increases with the increase of concentration. Figure 1 (right) is the absorption spectrum of the J-polymer combined with the nano device. It can be seen that the intrinsic absorption peak of the material disappears, and the new absorption peak appears between 570-600 nm and 650-700 nm. As the concentration of the polymer increases, the position of the absorption peak is more strongly split. In recent years, research on the enhancement mechanism of this split has gradually become a hot spot. The results of this research will provide guidance for subsequent research.
The result has been published in the academic journal Nanoscale, entitled The role of Rabi splitting tuning in the dynamics of strongly coupled J-aggregates and surface plasmon polaritons in nanohole arrays (DOI: 10.1039 / C6NR01588C).
Figure 1 SEM image of the nanostructured device (left) and the absorption spectrum of the J-polymer combined with the nanodevice (right)
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