Strong coupling between Tamm plasmons and organic cavity polaritons is observed at room temperature. Angle-resolved reflectometry experiments unambiguously indicate the anticrossing in the dispersion relations, which is characteristic of the strong coupling regime, and the Tamm plasmon−cavity polariton hybrid states can be energetically manipulated by tuning the Tamm plasmons. The experimental data are in good agreement with calculations based on the transfer matrix method. Emission from the lower energy Tamm plasmon−cavity polariton hybrid states is observed, and the propagation property of the hybrid Tamm plasmon polariton is also studied. The real-space imaging experiments reveal that the propagation distance is larger when the Tamm plasmon and cavity polariton are strongly coupled in comparison to both the exciton of the uncoupled organic neat film and the cavity polaritons. Moreover, the propagation length of the hybrid polaritons increases as the fraction of Tamm plasmon component in the hybrid states increases.

Au-Fe3O4 hybrid hollow spheres have been successfully synthesized by a one-pot process via the hydrothermal treatment of FeCl3, HAuCl4, citrate, urea, and polyacrylamide (PAM). The amount of Au nanoparticles located in the hybrid hollow spheres can be tuned by changing the molar ratio of Au/Fe precursors. A possible synthetic mechanism of the Au-Fe3O4 hybrid hollow spheres has been proposed. The obtained hybrids exhibit not only a superior surface-enhanced Raman scattering (SERS) sensitivity, but also an excellent catalytic activity. The detection limit of the Au-Fe3O4 hybrid hollow spheres (the Au/Fe molar ratio is 0.2, Au-Fe3O4-0.2) for R6G can reach up to 10(-10) M, which can meet the required concentration level for ultratrace detection of analytes using SERS. Furthermore, the catalytic experiments of the Au-Fe3O4-0.2 hybrid hollow spheres demonstrate that the model of 4-nitrophenol (4-NP) molecules can be degraded within 3 min and the catalytic activity can be recovered without sharp activity loss in six runs, which indicates their superior catalytic degradation activity. The reason may be due to the highly efficient partial charge transfer between Au and Fe3O4 at the nanoscale interface. The results indicate that the bifunctional Au-Fe3O4 hybrid hollow spheres can serve as promising materials in trace detection and industrial waste water treatment.