[21p-A404-1~17] 3.11 Nanoscale optical science and near-field optics (formerly 3.12)

[21p-A404-5] Enhancement effect of plasmonic hotspots on solid-state TTA-UC

〇Udai Danyoshi¹, Naoyuki Harada¹, Takeo Nakano^3,4, Nobuhiro Yanai^1,2,4, Shigenori Fujikawa^1,2,3,4, Nobuo Kimizuka^1,2,4 (1.Grad. Sch. of Eng., Kyushu Univ, 2.CMS, Kyushu Univ., 3.WPI-I2CNER, Kyushu Univ., 4.K-NETs, Kyushu Univ.)

Keywords:Block copolymer, Large-area plasmonic nano-interface, Solid-state TTA-UC

Noble metal nanoparticles adjacent to each other through a nanometer gap exert a significantly enhanced electromagnetic field based on the localized surface plasmon effect. These hotspots are expected to amplify the absorption and emission of dye molecules greatly. In this study, we fabricated large-area plasmonic gold nanogap arrays (AuNA) with highly integrated hotspots by utilizing the spontaneous nanophase-separated structure of block copolymers. We employed the AuNA to amplify photon upconversion based on solid-state triplet-triplet annihilation (TTA-UC): A nanolayer of a donor molecule and an acceptor molecule was introduced into nanogap of AuNA, and its TTA-UC performance was evaluated. In this report, we will discuss the effect of particle size and gap size of AuNA on TTA-UC behavior.