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Quantum optics

Spin gives direction

Light emitted near an optical waveguide is captured and equally split into two modes with opposite directions of propagation. By controlling the dipole spin of the emitter, it is possible to break this symmetry and select only one direction.

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Figure 1: The light emitted by a localized dipole oscillating at optical frequencies is coupled to an optical waveguide, which is a vacuum-clad fibre in this schematic.
Figure 2: Evanescent field structure for the two modes propagating in opposite directions in the waveguide.


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Correspondence to Lorenzo Marrucci.

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Marrucci, L. Spin gives direction. Nature Phys 11, 9–10 (2015).

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