Figure 2.

(a) Normalized extinction spectra of the bridged dimer in GST-mediated, full-metallic, and air regimes. The inset is the normalized extinction cross-section for the same dimer without conductive junction and plotted for the capacitive coupling regime (the offset gap between nanoparticles is 15 nm). (b,c) E-field maps across the bridged dimer for dipolar and CTP resonant mode in full metallic regime, respectively, for both (i) top-view and (ii) cross-sectional views. (d,e) The local E-field distributions correlating with the dipolar and CTP resonant peaks, respectively, for both (i) top-view and (ii) cross-sectional views. (iii) The electric-field intensity diagrams |E|² for the metallodielectric and metallic dimers at the position of CTP and dipolar modes.