Figure 1 | Schematic diagram of Lorentz-term-driven SHG induced by the magnetic dipole (MD) resonance in a dimer-on-film nanocavity: the plasmon-enhanced, spatially overlapping electromagnetic field at the fundamental frequency amplifies the Lorentz contr (IMAGE)
Caption
Figure 1 | Schematic diagram of Lorentz-term-driven SHG induced by the magnetic dipole (MD) resonance in a dimer-on-film nanocavity: the plasmon-enhanced, spatially overlapping electromagnetic field at the fundamental frequency amplifies the Lorentz contribution at the harmonic frequency. a Schematic of the nanocavity, consisting of two 100 nm-diameter Au nanoparticles coated with 2 nm silica shells, placed on a smooth Au film. The silica shells form three stable nanoscale gaps, creating a ternary LC resonant circuit that excites the MD resonance. b Dark-field scattering spectrum measured with a custom-built angularly tunable and polarization-controlled single-particle dark-field scattering microscope, showing the MD resonance peak at ~950 nm with a linewidth of ~50 nm (Q ≈ 19, significantly larger than the Q of the electric resonance). c Surface charge distributions, d electric field enhancement maps, and e, magnetic field enhancement maps of magnetic dipole. f Coulomb, g Lorentz, and h Convective contribution to the second-order charge distributions, clearly showing the dominant contribution of the Lorentz term in the hotspot region.
Credit
Wang, Y., Razdolski, I. et al.
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CC BY