Functional THz emitters based on Pancharatnam-Berry phase nonlinear metasurfaces

Cormac McDonnell, Junhong Deng, Symeon Sideris, Tal Ellenbogen () and Guixin Li ()
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Cormac McDonnell: School of Electrical Engineering, Tel-Aviv University
Junhong Deng: Southern University of Science and Technology
Symeon Sideris: School of Electrical Engineering, Tel-Aviv University
Tal Ellenbogen: School of Electrical Engineering, Tel-Aviv University
Guixin Li: Southern University of Science and Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Recent advances in the science and technology of THz waves show promise for a wide variety of important applications in material inspection, imaging, and biomedical science amongst others. However, this promise is impeded by the lack of sufficiently functional THz emitters. Here, we introduce broadband THz emitters based on Pancharatnam-Berry phase nonlinear metasurfaces, which exhibit unique optical functionalities. Using these new emitters, we experimentally demonstrate tunable linear polarization of broadband single cycle THz pulses, the splitting of spin states and THz frequencies in the spatial domain, and the generation of few-cycle pulses with temporal polarization dispersion. Finally, we apply the ability of spin control of THz waves to demonstrate circular dichroism spectroscopy of amino acids. Altogether, we achieve nanoscale and all-optical control over the phase and polarization states of the emitted THz waves.

Date: 2021
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DOI: 10.1038/s41467-020-20283-0

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