Complete polarization control for a nanofiber waveguide using directional coupling
arXiv:1904.05513 · doi:10.1103/PhysRevApplied.11.064041
Abstract
Optical nanofiber waveguides are widely used for near-field delivery and measurement of light. Despite their versatility and efficiency, nanofibers have a critical drawback - their inability to maintain light's polarization state on propagation. Here, we design a directional coupler consisting of two crossed nanofibers to probe the polarization state at the waist region. Directionality of coupling occurs due to asymmetric dipolar emission or spin-locking when the evanescent field pattern breaks the mirror symmetry of the crossed-nanofiber system. We demonstrate that, by monitoring the outputs from the directional coupler, two non-orthogonal polarization states can be prepared at the nanofiber waist with a fidelity higher than 99%. Based on these states, we devise a simple and reliable method for complete control of the polarization along a nanofiber waveguide.
8 pages, 8 figures
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- Experimental Observation of Berry Phases in Optical Moebius-strip Microcavities
- Polarization-Controlled Cavity Input-Output Relations
- Enhanced Directional Coupling of Light with a Whispering Gallery Microcavity
- Polarisation control for optical nanofibres by imaging through a single lens
- Spin selection rule for {\it S} level transitions in atomic rubidium under paraxial and nonparaxial two-photon excitation
- Direct optical excitation of an NV center via a nanofiber Bragg-cavity: A theoretical simulation
- Spin-orbit interaction in nanofiber-based Brillouin scattering
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