fig7

Figure 7. The shape- and coupling-dependent plasmonic responses of Au nanostructures are of particular interest. (A) FDTD map of a five-sphere chain showing longitudinal hotspots^[114]. Copyright 2019, reproduced with permission. Published by John Wiley and Sons; (B) Field localization patterns of star- and rod-shaped Au antennas^[115]. Copyright 2020, reproduced with permission. Published by the American Chemical Society; For (C and D) Extinction, scattering, and absorption efficiencies for nanoparticles with an equivalent radius of 15 nm, together with electric-field distributions at the primary LSPR modes highlighting edge and corner-localized hot-spots^[120]. Copyright 2019, reproduced with permission. Published by the American Chemical Society. E₀: Incident electric field; FDTD: finite-difference time-domain; R_eq: equivalent radius; LSPR: localized surface plasmon resonance.