Single-pulse terahertz spectroscopy monitoring sub-millisecond time dynamics at a rate of 50 kHz

Nicolas Couture (), Wei Cui, Markus Lippl, Rachel Ostic, Défi Junior Jubgang Fandio, Eeswar Kumar Yalavarthi, Aswin Vishnuradhan, Angela Gamouras, Nicolas Y. Joly and Jean-Michel Ménard ()
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Nicolas Couture: University of Ottawa
Wei Cui: University of Ottawa
Markus Lippl: Max Planck Institute for the Science of Light
Rachel Ostic: University of Ottawa
Défi Junior Jubgang Fandio: University of Ottawa
Eeswar Kumar Yalavarthi: University of Ottawa
Aswin Vishnuradhan: University of Ottawa
Angela Gamouras: University of Ottawa
Nicolas Y. Joly: Max Planck Institute for the Science of Light
Jean-Michel Ménard: University of Ottawa

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Slow motion movies allow us to see intricate details of the mechanical dynamics of complex phenomena. If the images in each frame are replaced by terahertz (THz) waves, such movies can monitor low-energy resonances and reveal fast structural or chemical transitions. Here, we combine THz spectroscopy as a non-invasive optical probe with a real-time monitoring technique to demonstrate the ability to resolve non-reproducible phenomena at 50k frames per second, extracting each of the generated THz waveforms every 20 μs. The concept, based on a photonic time-stretch technique to achieve unprecedented data acquisition speeds, is demonstrated by monitoring sub-millisecond dynamics of hot carriers injected in silicon by successive resonant pulses as a saturation density is established. Our experimental configuration will play a crucial role in revealing fast irreversible physical and chemical processes at THz frequencies with microsecond resolution to enable new applications in fundamental research as well as in industry.

Date: 2023
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DOI: 10.1038/s41467-023-38354-3

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