Back-Scattering Properties of a Waveguide-Coupled Array of Atoms in the Strongly Non-Paraxial Regime

Author(s): D. Reitz, C. Sayrin, B. Albrecht, Igor Mazets, R. Mitsch, A. Rauschenbeutel

Journal: Phys. Rev. A

Volume: 89

Page(s): 031804

Year: 2014

DOI Number: 10.1103/PhysRevA.89.031804

Link: Link to publication


We experimentally investigate the back-scattering properties of an array of atoms that is evanescently coupled to an optical nanofiber in the strongly non-paraxial regime. We observe that the power and the polarization of the back-scattered light depend on the nanofiber-guided excitation field in a way that significantly deviates from the predictions of a simple model based on two-level atoms and a scalar waveguide. Even though it has been widely used in previous experimental and theoretical studies of waveguide-coupled quantum emitters, this simple model is thus in general not adequate even for a qualitative description of such systems. We develop an ab initio model which includes the multi-level structure of the atoms and the full vectorial properties of the guided field and find very good agreement with our data.


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