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

Title
Tunable directional radiation of a dipole inside a cuboid slot on a dielectric substrate
Author
천상모
Keywords
LIGHT-EMISSION; REAL METAL; INTERFACE; ANTENNA; ENHANCEMENT; NANOANTENNA; DEPENDENCE; PATTERNS; EMITTERS
Issue Date
2015-09
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v. 118, no. 9, article no. 093104
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.
URI
http://aip.scitation.org/doi/abs/10.1063/1.4928813http://hdl.handle.net/20.500.11754/27860
ISSN
0021-8979; 1089-7550
DOI
10.1063/1.4928813
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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