[14a-B309-1~10] 3.12 Nanoscale optical science and near-field optics

[14a-B309-7] Evaluation of strong coupling between plasmon and molecular exciton resonance at silver nanoparticle dimer junctions using classical electromagnetism

〇Tamitake Itoh¹, Yuko S. Yamamoto², Takayuki Okamoto³ (1.AIST, 2.JAIST, 3.RIKEN)

Keywords:plasmon, strong coupling, surface enhanced Raman scattering

Evidence of strong coupling between plasmons and molecular excitons for plasmonic nanoparticle dimers exhibiting ultra-sensitive surface enhanced resonant Raman scattering is the observation of anti-crossing in the coupled resonance. However, experimentally tuning the plasmon resonance of such dimers for the observation is difficult. We calculate the anti-crossing property of dimers coated with thin dye films according to the classical electromagnetism. This property is quantitatively evaluated according to the coupled oscillator model composed of a plasmon and a molecular exciton representing the molecular multi-level system.