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Lindfors, Klas ; Dregely, Daniel ; Lippitz, Markus ; Engheta, Nader ; Totzeck, Michael ; Giessen, Harald:
Imaging and Steering Unidirectional Emission from Nanoantenna Array Metasurfaces.
In: ACS Photonics.
Bd. 3
(2016)
Heft 2
.
- S. 286-292.
ISSN 2330-4022
DOI: https://doi.org/10.1021/acsphotonics.5b00646
Abstract
In radiofrequency antenna engineering, the array factor made long-distance communication with steerable transmission and receiving possible. At optical frequencies, low-loss signal transmission via free space by using nanoantennas is still in its infancy. Here, we suggest applying the array factor to the optical frequency regime by shaping the radiation pattern of plasmonic metasurfaces featuring nanoantenna arrays. We arrange dipolar gold nanoantennas operating at 785 nm wavelength in wavelength-sized arrays and control the phase that drives the antenna elements. We obtain collimated and unidirectional radiation from this metasurface upon illumination with circularly polarized light, which is not prone to major losses as in common plasmonic waveguide structures. We furthermore demonstrate switching the unidirectional emission to opposite directions with additional beamsteering by modifying the array factor. Our experiment corroborates the evidence for spin–orbit coupling between the helicity of light and suitably designed plasmonic metasurfaces, which can exhibit the spin-Hall effect for light.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | Optical nanoantenna; array factor; metasurface; luminescent imaging; beam steering |
| Institutionen der Universität: | Fakultäten Fakultäten > Fakultät für Mathematik, Physik und Informatik Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik III - Nanooptik Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik III - Nanooptik > Lehrstuhl Experimentalphysik III - Nanooptik - Univ.-Prof. Dr. Markus Lippitz |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik > 530 Physik |
| Eingestellt am: | 29 Jan 2016 09:33 |
| Letzte Änderung: | 24 Jan 2022 14:27 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/30097 |