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Beam steering of a single nanoantenna

Authors
Kim, Hwi-MinKim, Myung-Ki
Issue Date
25-5월-2020
Publisher
OPTICAL SOC AMER
Citation
OPTICS EXPRESS, v.28, no.11, pp.16822 - 16833
Indexed
SCIE
SCOPUS
Journal Title
OPTICS EXPRESS
Volume
28
Number
11
Start Page
16822
End Page
16833
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/55644
DOI
10.1364/OE.392999
ISSN
1094-4087
Abstract
Nanoantennas play an important role as mediators to efficiently convert free-space light into localized optical energy and vice versa. However, effective control of the beam direction of a single nanoantenna remains a great challenge. In this paper, we propose an approach to steer the beam direction of a single nanoantenna by adjusting two antenna modes with opposite phase symmetry. Our theoretical study confirmed that the combination of even- and odd-symmetric modes with a phase difference of pi/2 enables effective beam steering of a single nanoantenna whose steering angle is controlled by adjusting the amplitude ratio of the two antenna modes. To implement our theory in real devices, we introduced asymmetric trapezoidal nano-slot antennas with different side air-gaps of 10 and 50 nm. The trapezoidal nanoantennas can simultaneously excite the dipole and quadrupole modes in a single nanoantenna and enables effective beam steering with an angle of greater than 35 degrees near the resonance of the quadrupole mode. In addition, the steering angle can also be controlled by adjusting the degree of asymmetry of the trapezoidal slot structure. We believe that our beam steering method for a single nanoantenna will find many potential applications in fields such as imaging, sensing, optical communication, and quantum optics. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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Graduate School > KU-KIST Graduate School of Converging Science and Technology > 1. Journal Articles

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