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

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 we introduce a rigorous theoretical framework for engineering the angular spectra encompassing both far- and near-fields of electric and magnetic sources and develop a unified description of both free space and guided mode directional radiation. 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. We show 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.

References in corpus (13)

• Spin-orbit interactions of light
• Directional visible light scattering by silicon nanoparticles
• Quantum spin Hall effect of light
• Chiral nanophotonic waveguide interface based on spin-orbit coupling of light
• Universal spin-momentum locking of evanescent waves
• Chirality of nanophotonic waveguide with embedded quantum emitter for unidirectional spin transfer
• Generalized Brewster-Kerker effect in dielectric metasurfaces
• Polarization engineering in photonic crystal waveguides for spin-photon entanglers
• Janus and Huygens' dipolar sources for near-field directionality
• Polarization Controlled Directional Scattering for Nanoscopic Position Sensing
• Excitation of radiationless anapole mode of isotropic dielectric nanoparticles with tightly focused radially polarized beam
• Transverse Kerker Scattering for Angstrom Localization of Nanoparticles
• Experimental demonstration of linear and spinning Janus dipoles for polarisation and wavelength selective near-field coupling

Cited by in corpus (4)

• Experimental Realization of Near-Field Photonic Routing with All-Electric Metasources
• Far-field and near-field directionality in acoustic scattering
• Mode-selective Single-dipole Excitation and Controlled Routing of Guided Waves in a Multi-mode Topological Waveguide
• The dependence of evanescent wave polarization on the losses of guided optical modes