[15a-PA4-1~29] 3.12 Nanoscale optical science and near-field optics

[15a-PA4-14] Fluorescence intensity distribution inside the Bull’s eye pattern depending on the pitch of a Bull’s eye-plasmonic chip

〇Tomoya Nagasue¹, Yuki Omura¹, Keiko Tawa¹ (1.Kwansei Gakuin Univ.)

Keywords:Bull's eye, fluorescence microscope, periodic structure

In this study, we used two kinds of Bull’s eye-plasmonic chips composed of concentric circle structure to examine the fluorescence intensity distribution of a single nanoparticles within the Bull’s eye pattern by epi-illumination. For the chip with pitch (Λ) of 480 nm, the difference in the fluorescence intensity of the bright spot was little found for any position inside pattern. However, at Λ = 400 nm, the fluorescence intensity increased closer to the center of a pattern. Comparing with the bright spot outside the pattern, about three-fold fluorescence intensity was obtained at center of a pattern.