Erlangen 2022 – scientific programme
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A: Fachverband Atomphysik
A 12: Ultracold Atoms and Plasmas (joint session Q/A)
A 12.9: Poster
Tuesday, March 15, 2022, 16:30–18:30, P
Point-spread-function engineering for 3D atom microscopy — •Tangi Legrand1, Carrie Ann Weidner2, Brian Bernard3, Gautam Ramola1, Richard Winkelmann1, Dieter Meschede1, and Andrea Alberti1 — 1Institut für Angewandte Physik der Universität Bonn, Bonn, Germany — 2Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark — 3École normale supérieure Paris-Saclay, Gif-sur-Yvette, France
Quantum gas microscopes can resolve atoms trapped in a 3D optical lattice down to the single site in the horizontal plane. Along the line of sight, however, a much lower resolution is achieved when the position in this direction is inferred from the defocus. It is shown how phase-front engineering can be used to detect atoms' positions with submicrometer resolution in the three dimensions using a single image acquisition. By means of a spatial light modulator, we imprint a phase modulation in the Fourier plane of the imaging system, resulting in a superposition of Laguerre-Gaussian modes at the camera. As a result, the so-called point spread function of the imaging system exhibits a spiraling intensity distribution along the line of sight. The angle of the spiraling distribution encodes the position in the third dimension. As a proof of concept, we set up an optical experiment reproducing the conditions of a quantum gas microscope. The choice and optimization of the mode superposition and an implementation scheme for Bonn's quantum walk setup is discussed. This method can find applications in other quantum gas experiments to extend the domain of quantum simulation from two to three dimensions.