Scientific Results

Scanning planar Yagi-Uda antenna for fluorescence detection

Year: 2021

Authors: Soltani, Navid; Esfahany, Elham Rabbany; Druzhinin, Sergey, I; Schulte, Gregor; Mueller, Julian; Sledz, Florian; Flatae, Assegid Mengistu; Butz, Benjamin; Schoenherr, Holger; Markesevic, Nemanja; Agio, Mario

Autors Affiliation: Laboratory of Nano-Optics, University of Siegen, Siegen 57072, Germany; Research Center for Micro and Nano-Chemistry and Engineering (Cμ), Siegen 57076, Germany; Physical Chemistry I, University of Siegen, Siegen 57076, Germany; Micro- and Nanoanalytics Group, University of Siegen, Siegen 57076, Germany; Currently with Nanoscience Center, University of Jyväskylä, Jyväskylä 40014, Finland; National Institute of Optics (INO), National Research Council (CNR), Florence 50125, Italy

Abstract: An effective approach to improve the detection efficiency of nanoscale light sources relies on a planar antenna configuration, which beams the emitted light into a narrow cone. Planar antennas operate like optical Yagi-Uda antennas, where reflector and director elements are made of metal films. Here we introduce and investigate, both theoretically and experimentally, a scanning implementation of a planar antenna. Using a small ensemble of molecules contained in fluorescent nanobeads placed in the antenna, we independently address the intensity, radiation pattern, and decay rate as a function of distance between a flat-tip scanning gold wire (reflector) and a thin gold film coated on a glass coverslip (director). The scanning planar antenna changes the radiation pattern of a single fluorescent bead, and it beams light into a narrow cone down to angles of 45∘ (full width at half maximum). Moreover, the collected signal compared to the case of a glass coverslip is larger than a factor of three, which is mainly due to the excitation enhancement. These results offer a better understanding of the modification of light–matter interaction by planar antennas, and they hold promise for applications such as sensing, imaging, and diagnostics.


Volume: 38 (9)      Pages from: 2528  to: 2535

KeyWords: optical antennas, fluorescence detection
DOI: 10.1364/JOSAB.434980

Citations: 1
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2022-01-16
References taken from IsiWeb of Knowledge: (subscribers only)
Connecting to view paper tab on IsiWeb: Click here
Connecting to view citations from IsiWeb: Click here

This site uses cookies. If you decide to continue browsing we consider that you accept their use. For more information about cookies and how to delete them please read our Info Policy on cookies use.
Read more