Ultrafast all-optical second harmonic wavefront shaping

Artem Sinelnik, Shiu Hei Lam, Filippo Coviello, Sebastian Klimmer, Giuseppe Valle, Duk-Yong Choi, Thomas Pertsch, Giancarlo Soavi and Isabelle Staude ()
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Artem Sinelnik: Friedrich Schiller University Jena
Shiu Hei Lam: Friedrich Schiller University Jena
Filippo Coviello: Friedrich Schiller University Jena
Sebastian Klimmer: Friedrich Schiller University Jena
Giuseppe Valle: Politecnico di Milano
Duk-Yong Choi: Australian National University
Thomas Pertsch: Friedrich Schiller University Jena
Giancarlo Soavi: Friedrich Schiller University Jena
Isabelle Staude: Friedrich Schiller University Jena

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Optical communication can be revolutionized by encoding data into the orbital angular momentum of light beams. However, state-of-the-art approaches for dynamic control of complex optical wavefronts are mainly based on liquid crystal spatial light modulators or miniaturized mirrors, which suffer from intrinsically slow (µs-ms) response times. Here, we experimentally realize a hybrid meta-optical system that enables complex control of the wavefront of light with pulse-duration limited dynamics. Specifically, by combining ultrafast polarization switching in a WSe2 monolayer with a dielectric metasurface, we demonstrate second harmonic beam deflection and structuring of orbital angular momentum on the femtosecond timescale. Our results pave the way to robust encoding of information for free space optical links, while reaching response times compatible with real-world telecom applications.

Date: 2024
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DOI: 10.1038/s41467-024-46642-9

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