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Scanning planar Yagi-Uda antenna for fluorescence detection

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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 ${45^ \circ}$ (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.

© 2021 Optical Society of America

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Corrections

Navid Soltani, Elham Rabbany Esfahany, Sergey I. Druzhinin, Gregor Schulte, Julian Müller, Florian Sledz, Assegid Mengistu Flatae, Benjamin Butz, Holger Schönherr, Nemanja Markešević, and Mario Agio, "Scanning planar Yagi-Uda antenna for fluorescence detection: erratum," J. Opt. Soc. Am. B 38, 3532-3532 (2021)
https://opg.optica.org/josab/abstract.cfm?uri=josab-38-11-3532

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Scanning planar Yagi-Uda antenna for fluorescence detection: erratum

Navid Soltani, Elham Rabbany Esfahany, Sergey I. Druzhinin, Gregor Schulte, Julian Müller, Florian Sledz, Assegid Mengistu Flatae, Benjamin Butz, Holger Schönherr, Nemanja Markešević, and Mario Agio
J. Opt. Soc. Am. B 38(11) 3532-3532 (2021)

Supplementary Material (1)

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Supplement 1       Supplementary information.

Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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