Amplitude and phase control of guided modes excitation from a single dipole source: engineering far- and near-field directionality

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Abstract

The design of far-field radiation diagrams from combined electric and magnetic dipolar sources has recently found applications in nanophotonic metasurfaces that realize tailored reflection and refraction. Such dipolar sources also exhibit important near-field evanescent coupling properties with applications in polarimetry and quantum optics. Here, a rigorous theoretical framework is introduced for engineering the angular spectra encompassing both far- and near-fields of electric and magnetic sources and a unified description of both free space and guided mode directional radiation is developed. The approach uses the full parametric space of six complex-valued components of magnetic and electric dipoles in order to engineer constructive or destructive near-field interference. Such dipolar sources can be realized with dielectric or plasmonic nanoparticles. It is shown how a single dipolar source can be designed to achieve the selective coupling to multiple waveguide modes and far-field simultaneously with a desired amplitude, phase, and direction.

Original languageEnglish
Article number1900250
JournalLaser and Photonics Reviews
Volume13
Issue number12
Early online date13 Nov 2019
DOIs
Publication statusPublished - 1 Dec 2019

Keywords

  • guided modes
  • light's directionality
  • nanophotonics

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