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

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 −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.
Authors:
;  [1] ; ;  [2]
  1. Samsung Advanced Institute of Technology, Suwon-si, Gyeonggi-do 443-803 (Korea, Republic of)
  2. Department of Physics, Korea University, Seoul 136-701 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22494820
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AIR; ANISOTROPY; DIELECTRIC MATERIALS; DIPOLES; EV RANGE; RESONANCE; SUBSTRATES; SURFACES; VISIBLE SPECTRA