Fig. 3

Strong coupling between Ag nanoparticles and J-aggregates. a Scanning transmission electron microscope (STEM) images of initial Ag nanoprisms and Ag nanodisks after heating of Ag nanoprisms. b (left) Experimental and (right) simulated extinction spectra of Ag nanodisks coupled to the J-aggregates. c Electric field distribution of single polaritonic nanoparticle at 560 nm, 587 nm, and 612 nm. d Ag nanoprism coupled to the J-aggregates. e Scattering and PL spectra of hybrid nanostructures excited by 532, 568, and 640 nm laser excitations. f Highly blue-detuned and red-detuned scattering spectra, together with the corresponding PL spectra. g Temperature-dependent PL spectra of a single hybrid nanostructure measured at T = 4–300 K. h Ag nanoprisms coupled to the J-aggregates. i Absorption spectra of Ag nanoprisms@J-aggregates systems. j Ag nanoprisms coupled to the J-aggregates. k Extinction spectra of Ag nanoprisms@J-aggregates systems at different pH values of the aqueous solution. Reproduced with permissions from [40, 44,45,46], respectively