Dynamic complex opto-magnetic holography

M. Makowski (), J. Bomba, A. Frej, M. Kolodziejczyk, M. Sypek, T. Shimobaba, T. Ito, A. Kirilyuk and A. Stupakiewicz ()
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M. Makowski: Warsaw University of Technology
J. Bomba: University of Bialystok
A. Frej: University of Bialystok
M. Kolodziejczyk: University of Bialystok
M. Sypek: Warsaw University of Technology
T. Shimobaba: Chiba University
T. Ito: Chiba University
A. Kirilyuk: Radboud University
A. Stupakiewicz: University of Bialystok

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Despite recent significant progress in real-time, large-area computer-generated holography, its memory requirements and computational loads will be hard to tackle for several decades to come with the current paradigm based on a priori calculations and bit-plane writing to a spatial light modulator. Here we experimentally demonstrate a holistic approach to serial computation and repeatable writing of computer-generated dynamic holograms without Fourier transform, using minimal amounts of computer memory. We use the ultrafast opto-magnetic recording of holographic patterns in a ferrimagnetic film with femtosecond laser pulses, driven by the on-the-fly hardware computation of a single holographic point. The intensity-threshold nature of the magnetic medium allows sub-diffraction-limited, point-by-point toggling of arbitrarily localized magnetic spots on the sample, according to the proposed circular detour-phase encoding, providing complex modulation and symmetrical suppression of upper diffractive orders and conjugated terms in holographically reconstructed 3-D images.

Date: 2022
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DOI: 10.1038/s41467-022-35023-9

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