at Google ScholarTitle data
Lindfors, Klas ; Dregely, Daniel ; Lippitz, Markus ; Engheta, Nader ; Totzeck, Michael ; Giessen, Harald:
Imaging and Steering Unidirectional Emission from Nanoantenna Array Metasurfaces.
In: ACS Photonics.
Vol. 3
(2016)
Issue 2
.
- pp. 286-292.
ISSN 2330-4022
DOI: https://doi.org/10.1021/acsphotonics.5b00646
Abstract in another language
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.
Further data
| Item Type: | Article in a journal |
|---|---|
| Refereed: | Yes |
| Keywords: | Optical nanoantenna; array factor; metasurface; luminescent imaging; beam steering |
| Institutions of the University: | Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics III - Nanooptics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Experimental Physics III - Nanooptics > Chair Experimental Physics III - Nanooptics - Univ.-Prof. Dr. Markus Lippitz |
| Result of work at the UBT: | Yes |
| DDC Subjects: | 500 Science > 530 Physics |
| Date Deposited: | 29 Jan 2016 09:33 |
| Last Modified: | 24 Jan 2022 14:27 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/30097 |