Fig. 4

Strong coupling between bimetallic nanoparticles and J-aggregates. a Shape engineering of nanodisks into nanorings. b Extinction spectra of Ag-Au-alloyed nanorings containing (left) small nanoholes and (right) large nanoholes coupled to the J-aggregates with varying amounts of J-aggregate dye. c Electric field distribution of a single nanoring at resonance wavelength with varying inner diameter. d Au@Ag nanocuboids coupled to the J-aggregates. e Extinction spectra of (I) bare Au@Ag nanocuboids, (II) pristine J-aggregates, and (III) Au@Ag nanocuboid@J-aggregates hybrids. f Scattering spectra of the individual hybrids system with different numbers of J-aggregates. g Ag@Au HNSs coupled to the J-aggregates. h Extinction spectra of (I) bare Ag@Au HNSs, (II) pristine J-aggregates, and (III) Ag@Au HNSs@J-aggregates hybrids. i Ag@Au HNCs coupled to the J-aggregates. j (top) Extinction spectra and (bottom) anticrossing behavior curves of the Ag@Au HNCs@J-aggregates system. Reproduced with permissions from [47, 49,50,51], respectively