Journal
SCIENCE
Volume 340, Issue 6130, Pages 328-330Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1233739
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Funding
- Engineering and Physical Sciences Research Council [EP/H000917/2]
- FPI of Generalitat Valenciana
- Spanish government [CSD2008-00066, TEC2011-28664-C02-02]
- Royal Society
- EPSRC [EP/K007793/1, EP/H000917/2] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K007793/1, EP/H000917/2] Funding Source: researchfish
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Wave interference is a fundamental manifestation of the superposition principle with numerous applications. Although in conventional optics, interference occurs between waves undergoing different phase advances during propagation, we show that the vectorial structure of the near field of an emitter is essential for controlling its radiation as it interferes with itself on interaction with a mediating object. We demonstrate that the near-field interference of a circularly polarized dipole results in the unidirectional excitation of guided electromagnetic modes in the near field, with no preferred far-field radiation direction. By mimicking the dipole with a single illuminated slit in a gold film, we measured unidirectional surface-plasmon excitation in a spatially symmetric structure. The surface wave direction is switchable with the polarization.
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