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Title: Optical magnetism and wavefront control by arrays of strontium atoms
Authors: Ballantine, K. E.
Wilkowski, David
Ruostekoski, J.
Keywords: Science::Physics
Issue Date: 2022
Source: Ballantine, K. E., Wilkowski, D. & Ruostekoski, J. (2022). Optical magnetism and wavefront control by arrays of strontium atoms. Physical Review Research, 4(3).
Project: R-710-002-016-271
Journal: Physical Review Research
Abstract: By analyzing the parameters of electronic transitions, we show how bosonic Sr atoms in planar optical lattices can be engineered to exhibit optical magnetism and other higher-order electromagnetic multipoles that can be harnessed for wavefront control of incident light. Resonant λ≃2.6μm light for the ³D₁ →³P₀ transition mediates cooperative interactions between the atoms while the atoms are trapped in a deeply subwavelength optical lattice. The atoms then exhibit collective excitation eigenmodes, e.g., with a strong cooperative magnetic response at optical frequencies, despite individual atoms having negligible coupling to the magnetic component of light. We provide a detailed scheme to utilize excitations of such cooperative modes consisting of arrays of electromagnetic multipoles to form an atomic Huygens' surface, with complete 2π phase control of transmitted light and almost no reflection, allowing nearly arbitrary wavefront shaping. In the numerical examples, this is achieved by controlling the atomic level shifts of Sr with off-resonant ³PJ→³D₁ transitions, which results in a simultaneous excitation of arrays of electric dipoles and electric quadrupoles or magnetic dipoles. We demonstrate the wavefront engineering for a Sr array by realizing the steering of an incident beam and generation of a baby-Skyrmion texture in the transmitted light via a topologically nontrivial transition of a Gaussian beam to a Poincaré beam, which contains all possible polarizations in a single cross-section.
ISSN: 2643-1564
DOI: 10.1103/PhysRevResearch.4.033242
Schools: School of Physical and Mathematical Sciences 
Research Centres: Nanyang Quantum Hub
MajuLab, International Joint Research Unit IRL 3654, CNRS
Rights: © The Authors. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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