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

Sangmo Cheon, Chang Won Lee, Jong Ho Choe, Q Han Park

Research output: Contribution to journalArticle

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 -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.

Original languageEnglish
Article number093104
JournalJournal of Applied Physics
Volume118
Issue number9
DOIs
Publication statusPublished - 2015 Sep 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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