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Imaging and Steering Unidirectional Emission from Nanoantenna Array Metasurfaces

Title 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 (16 January 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 > Lehrstuhl Experimentalphysik III - Nanooptik
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik III - Nanooptik > Lehrstuhl Experimentalphysik III - Nanooptik - 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: 12 Sep 2016 09:33
URI: https://eref.uni-bayreuth.de/id/eprint/30097