Open AccessRadiation pattern of plasmonic nano-antennas in a homogeneous medium
Author(s) -
Takafumi Sugita,
Kaori Yanazawa,
Satoshi Maeda,
Holger F. Hofmann,
Y. Kadoya
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.013263
Subject(s) - optics , plasmon , radiation , radiation pattern , refractive index , materials science , isotropy , nano , substrate (aquarium) , optoelectronics , physics , antenna (radio) , telecommunications , oceanography , computer science , composite material , geology
Radiation patterns from plasmonic nano-antennas formed on a glass substrate were investigated using index-matching oils. It was confirmed that the pattern from single nano-antennas for various cases of index-mismatching between the substrate and the oil is explained well by the patterns of infinitesimal electric dipoles. We found that for an angular resolution of 2°, the index mismatch must be smaller than 0.001 to realize isotropic radiation. By using the appropriate condition, the radiation patterns of nano Yagi-Uda antennas in a quasi-homogeneous medium were obtained experimentally.