Presentation Information
[17a-WL2_201-9]Analysis of electromagnetic coupling between subradiant plasmon and dye molecular excitons using coupled oscillator model
〇Tamitake Itoh1, Yuko S. Yamamoto2 (1.AIST, 2.JAIST)
Keywords:
sub-radiant localized plasmon resonance,strong coupling,surface enhanced fluoresence
In the nanogaps of gold and silver nanoparticle dimers, the electric-field enhancement induced by plasmon resonance enables the observation of nonlinear optical responses, such as hyper-Raman scattering, even under continuous-wave laser excitation. Such nanogaps are referred to as hot spots (HSs). The strong field enhancement in HSs also suggests the possible formation of a strong coupling system between plasmons and excitons of a small number of dye molecules. For the analysis of such strongly coupled systems, radiative localized plasmon resonances (RLPRs) have been widely employed; however, systems in which the field enhancement is dominated by sub-radiative localized plasmon resonances (sub-RLPRs) are considered to exist more universally. Therefore, we attempted to observe spectral changes arising from strong coupling between sub-RLPRs and molecular excitons and to analyze the coupling using a coupled oscillator model.