Chiral near-field formation with all-dielectric nanoantennas
| Autor: | Pavel A. Belov, Denis G. Baranov, Alex Krasnok, Sergey V. Li |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Condensed matter physics business.industry Nanophotonics Physics::Optics Near and far field 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology 01 natural sciences Dipole 0103 physical sciences Quadrupole Optoelectronics 010306 general physics 0210 nano-technology business Multipole expansion Plasmon Excitation |
| Zdroj: | 2016 Days on Diffraction (DD). |
| DOI: | 10.1109/dd.2016.7756857 |
| Popis: | Engineering of intensity and direction of radiation from a single quantum emitter by means of structuring of their environment at the nanoscale is the cornerstone of modern nanophotonics. Recently discovered systems exhibiting spin-orbit coupling of light are of particular interest in this context. We have demonstrated that asymmetrical excitation of a high-index subwavelength dielectric nanoparticle by a point dipole source located in a notch at its surface can result in the formation of a chiral near field, which is similar to that of a circularly polarized dipole or quadrupole. Using numerical simulations, we have shown that this effect is the result of a higher multipole modes excitation within the nanoparticle. We have applied this effect for unidirectional excitation of dielectric waveguide and surface plasmon-polariton modes. We have achieved the value of front-to-back ratio up to 5.5 for dielectric waveguide and up to 7.5 for the plasmonic one. |
| Databáze: | OpenAIRE |
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