Nanophotonic control of circular dipole emission

B. le Feber, N. Rotenberg and L. Kuipers ()
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B. le Feber: Center for Nanophotonics, FOM Institute AMOLF
N. Rotenberg: Center for Nanophotonics, FOM Institute AMOLF
L. Kuipers: Center for Nanophotonics, FOM Institute AMOLF

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Controlling photon emission by single emitters with nanostructures is crucial for scalable on-chip information processing. Nowadays, nanoresonators can affect the lifetime of linear dipole emitters, while nanoantennas can steer the emission direction. Expanding this control to the emission of orbital angular momentum-changing transitions would enable a future coupling between solid state and photonic qubits. As these transitions are associated with circular dipoles, such control requires knowledge of the interaction of a complex dipole with optical eigenstates containing local helicity. We experimentally map the coupling of classical, circular dipoles to photonic modes in a photonic crystal waveguide. We show that, depending on the combination of the local helicity of the mode and the dipole helicity, circular dipoles can couple to left- or rightwards propagating modes with a near-unity directionality. The experimental maps are in excellent agreement with calculations. Our measurements, therefore, demonstrate the possibility of coupling the spin to photonic pathway.

Date: 2015
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DOI: 10.1038/ncomms7695

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