[20p-E208-1~21] 3.12 Nanoscale optical science and near-field optics

[20p-E208-17] Electrochemical tuning of strong coupling molecular excitons and lattice plasmon mode

〇Takahiro Hayashi¹, Shunpei Oikawa¹, Hiro Minamimoto², Kei Murakoshi² (1.Grad. Sch. of Chem. Sci. and Eng., Hokkaido Univ., 2.Dept. of Chem., Fac. of Sci., Hokkaido Univ.)

Keywords:strong coupling, molecular exciton, lattice plasmon

In the strong coupling regime between the localized surface plasmon (LSP) and molecular excitons, the new hybridized states form due to the coherent light energy exchange, leading to various unique photochemical phenomena. However, the accurate control of the strong coupling system is usually difficult issue because of the radiative energy dissipation. On the other hand, two-dimensional metal nanoparticle array shows the lattice plasmon (SLR) mode which is caused by the coherent interaction between LSP and diffractive light. It is known that SLR mode can confine light energy more efficiently compared to usual LSP mode, resulting in the suppression of radiative energy loss. In this study, we have deposited the coverage of the dye organic molecules onto the lattice structure for the formation of the strong coupling between molecules and SLR mode. As the result of extinction measurements, the formation of the strong coupling regime has been successfully observed as the peak splitting. In addition, we have successfully tuned the coupling strength under electrochemical potential control.