Functional THz emitters based on Pancharatnam-Berry phase nonlinear metasurfaces

Cormac McDonnell, Junhong Deng, Symeon Sideris, Tal Ellenbogen, Guixin Li

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number30
JournalNature Communications
Volume12
Issue number1
DOIs
StatePublished - 1 Dec 2021

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