UV plasmonic nanostructures have applications in label free native fluorescence biosensing. Many aluminum nanostructures have been shown to modify emission properties of UV fluorescence molecules. However, these structures demonstrate small rate enhancement factors (less than 10x). In this paper, we report FDTD simulation results on excitation and emission enhancement factors of a pair of aluminum bowtie antenna in ultraviolet region. Our results show that the optimal geometry is a pair of small bowtie (radius 20nm) with apex angle 60 degrees. The highest radiative enhancement is 25x (~340nm) and highest total decay rate enhancement is 70x, higher than previously studied geometries.

Date Published: 25 August 2017
PDF: 5 pages
Proc. SPIE 10346, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV, 1034615 (25 August 2017); doi: 10.1117/12.2274578

Published in SPIE Proceedings Vol. 10346:
Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XV
Din Ping Tsai; Takuo Tanaka, Editor(s)