Perfect Chirality with imperfect polarisation

Abstract

Unidirectional (chiral) emission of light from a circular dipole emitter into a waveguide is only possible at points of perfect circular polarisation (C points), with elliptical polarisations yielding a lower directional contrast. However, there is no need to restrict engineered systems to circular dipoles and with an appropriate choice of dipole unidirectional emission is possible for any elliptical polarization. Using elliptical dipoles, rather than circular, typically increases the size of the area suitable for chiral interactions (in an exemplary mode by a factor $\sim 30$), while simultaneously increasing coupling efficiencies. We propose illustrative schemes to engineer the necessary elliptical transitions in both atomic systems and quantum dots.

arXiv comment6 pages, 4 figures, plus supplementary

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Cited by in corpus (9)

• Observation of large spontaneous emission rate enhancement of quantum dots in a broken-symmetry slow-light waveguide
• Unconventional Quantum Electrodynamics with Hofstadter-Ladder Waveguide
• Systematic design of a robust half-W1 photonic crystal waveguide for interfacing slow light and trapped cold atoms
• Optimizing the chiral Purcell factor for unidirectional single photon emitters in topological photonic crystal waveguides using inverse design
• Waveguide Excitation and Spin Pumping of Chirally Coupled Quantum Dots
• Asymmetric Chiral Coupling in a Topological Resonator
• Quantum dots as optimized chiral emitters for photonic integrated circuits
• Scaling behavior of the degree of circular polarization of surface plasmon polariton
• Reflection by two level system: phase singularities on the Poincaré hypersphere