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Plasmon Ruler: Nanoparticle Dimer Coupling

Interactive 3D plasmon-ruler simulator: two gold nanospheres couple their localized surface plasmons as the gap between them shrinks, red-shifting the resonance and lighting up the near-field hot spot — the same exponential law used to measure nanoscale distances in biosensors.

Nanotechnology & MEMS3DAdvanced60 FPS📱 Mobile-adapted⇄ 2D version

Two gold nanospheres, each ringing with its own localized surface plasmon, start to talk to each other once their gap shrinks below a couple of diameters. Their dipole fields hybridize into a red-shifted "bonding" mode and the gap between them lights up as a near-field hot spot — the same physics behind surface-enhanced Raman spectroscopy. This simulator renders that dimer in real 3D and drives it with the universal plasmon-ruler equation (Jain, Huang & El-Sayed, 2007): the fractional resonance shift decays exponentially with the gap normalized by particle diameter, which is precisely why biosensors use a nanoparticle pair's color shift as a nanoscale ruler for measuring molecular distances and conformational changes label-free.

⚙ Under the hood

Interactive 3D simulator of two coupled gold nanospheres: watch their localized surface plasmons hybridize and the resonance red-shift exponentially as the gap shrinks, following the universal plasmon-ruler equation used in label-free nanoscale distance sensing.

plasmonicsnanoparticle-dimerLSPRbiosensingnear-fieldgold-nanoparticles

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install