Fig. 4. Theoretical frameworks illustrating the strong chiroptical phenomena in subwavelength chiral plasmonic systems.
a Plasmon hybridization theory and b coupled-mode theory, specifically the Born–Kuhn model, describing the electromagnetic chiral response of the coupled nanorod system shown in a. c Coupled-mode theory describing the chiroptical response of a complicated coupled system. a, b Reprinted with permission from ref. 53, copyright 2013, ACS. c Adapted with permission from ref. 52, copyright 2015, RSC