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Tunable directional radiation of a dipole inside a cuboid slot on a dielectric substrate

Authors
Cheon, SangmoLee, Chang-WonChoe, Jong-HoPark, Q-Han
Issue Date
7-9월-2015
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.118, no.9
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF APPLIED PHYSICS
Volume
118
Number
9
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/92496
DOI
10.1063/1.4928813
ISSN
0021-8979
Abstract
Far-field directional radiation of a single dipole in a cuboid slot is investigated in the presence of a dielectric substrate. Due to strong near field coupling between the dipole source and the surfaces of the slot and the dielectric, the far-field radiation shows strongly anisotropic pattern depending on the dipole radiation energy. By tuning local resonances within the air-slot interface or the substrate-slot interface, highly directional radiation either to free space or to the substrate space can be obtained. In the visible spectrum ranging from 1.2 eV to 3.5 eV, up to 18 fold directivity can be obtained. The up-to-down ratio can be tuned from similar to 7.5 dB to 10 dB. We identify induced eigenmodes responsible for highly unidirectional radiations as a function of the emitter spectrum and slot thickness to assess controllability of radiation power and direction. (C) 2015 AIP Publishing LLC.
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