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Engineering of intensity and direction of radiation from a single quantumemitter by means of structuring of their environment at the nanoscale is at thecornerstone of modern nanophotonics. Recently discovered systems exhibitingspin--orbit coupling of light are of particular interest in this context. Inthis Letter, we have demonstrated that asymmetrical excitation of a high-indexsubwavelength dielectric nanoparticle by a point dipole source located in anotch at its surface results in formation of a chiral near field, which issimilar to that of a circularly polarized dipole or quadrupole. Using numericalsimulations, we have shown that this effect is the result of a higher multipole(quadrupole and octupole) modes excitation within the nanoparticle. We haveapplied this effect for unidirectional excitation of dielectric waveguide andsurface plasmon-polariton modes. We have achieved the value of front--to--backratio up to 5.5 for dielectric waveguide and to 7.5 for the plasmonic one. Ourresults are important for the integrated nanophotonics and quantum informationprocessing systems.

All-dielectric nanoantennas for unidirectional excitation of electromagnetic guided modes