[19p-PA6-1~28] 3.12 Nanoscale optical science and near-field optics

[19p-PA6-3] Enhancement of Photoluminescence from Thin Layers of CdSe/ZnS Quantum Dots
by means of Surface Plasmon Resonance (2)

〇Toshiki Nakamura¹, Tetsuya Matsuyama¹, Kenji Wada¹, Koichi Okamoto¹ (1.Engineering,Osaka Pref. Univ.)

Keywords:plasmon, quantum dots, thin metal layers

Red emissions from thin layers of CdSe/ZnS quantum dots are enhanced by surface plasmon resonance on metal substrates. It turned to enhancements in the case of gold thin layers with 50 nm-thick with the SiO₂ thin layers. In the case of silver thin layers with 26.5 nm-thick, it turned from quenching to enhancement with the change of the surface structure by thermal annealing of the substrate at 200 ℃. Further enhancement was obtained by depositing a SiO₂ or Al₂O₃ thin layers on the metal surface. Peak wavelength of extinction spectra of silver thin layers with 26.5 nm-thick with Al₂O₃ thin layers matched emission of quantum dots, however, 25 nm-thick sample was the highest enhancements.