Universität zu Köln

Lindfors, Klas ORCID: 0000-0002-6482-5605, Dregely, Daniel, Lippitz, Markus ORCID: 0000-0003-1218-6511, Engheta, Nader, Totzeck, Michael and Giessen, Harald ORCID: 0000-0002-4270-3850 (2016). Imaging and Steering Unidirectional Emission from Nanoantenna Array Metasurfaces. ACS Photonics, 3 (2). S. 286 - 293. WASHINGTON: AMER CHEMICAL SOC. ISSN 2330-4022

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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 nano antennas 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 nano antenna 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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lindfors, Klas UNSPECIFIED orcid.org/0000-0002-6482-5605 UNSPECIFIED Dregely, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Lippitz, Markus UNSPECIFIED orcid.org/0000-0003-1218-6511 UNSPECIFIED Engheta, Nader UNSPECIFIED UNSPECIFIED UNSPECIFIED Totzeck, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Giessen, Harald UNSPECIFIED orcid.org/0000-0002-4270-3850 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-285315
DOI:	10.1021/acsphotonics.5b00646
Journal or Publication Title:	ACS Photonics
Volume:	3
Number:	2
Page Range:	S. 286 - 293
Date:	2016
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	2330-4022
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language 2ND-HARMONIC GENERATION; PHASE; ENHANCEMENT; LIGHT; NANOPARTICLE; EFFICIENCY; MOLECULES Multiple languages Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Optics; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28531