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Directional Optical Travelling Wave Antenna Based on Surface Plasmon Transmission Line
Author(s) -
Ding Yinxing,
Song Xiaokang,
Jiang Ping,
Jiao Rongzhen,
Wang Lulu,
Yu Li,
Zhang Jiasen
Publication year - 2018
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201700073
Subject(s) - beamwidth , optics , surface plasmon , radiation pattern , radiation , plasmon , nanophotonics , bandwidth (computing) , physics , beam steering , transmission line , antenna (radio) , optoelectronics , materials science , beam (structure) , telecommunications , computer science
Highly‐directional optical travelling wave antennas based on Ag nanowires are created, whose half‐power beamwidth is achieved as small as 20°. The radiation direction can be effectively adjusted over a range of up to 45.6° by changing the feeding surface plasmon modes, and they have an ultra‐broad bandwidth due to their nonresonant characteristic. A theoretical model based on mode coupling theory is constructed that can give a full description of the radiation properties, such as the radiation pattern, beam solid angle, radiation efficiency, and working bandwidth. The optical travelling wave antennas are easy to fabricate, control, and integrate with optical transmission lines; thus, they should have great potential applications in nanophotonic devices.