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Nonlinear Terahertz Generation in Semiconductor Metasurfaces

Hale, LL; Jung, H; Gennaro, SD; Briscoe, J; Harris, CT; Luk, TS; Addamane, SJ; ... Mitrofanov, O; + view all (2022) Nonlinear Terahertz Generation in Semiconductor Metasurfaces. In: 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). IEEE: Delft, Netherlands. Green open access

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Abstract

We demonstrate ultra-thin semiconductor metasurfaces for generation of THz pulses. By investigating the dependence of the THz amplitude and phase on excitation field polarization and crystal orientation, we deduce that the underlying THz emission mechanism in metasurfaces differs from bulk semiconductor wafers with second order nonlinearity playing a dominant role. The metasurface enables control of the THz phase and can therefore be used to spatially structure the THz emitted field. We use this effect to design and demonstrate a metasurface which simultaneously emits and focusses THz pulses.

Type: Proceedings paper
Title: Nonlinear Terahertz Generation in Semiconductor Metasurfaces
Event: 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
Dates: 28 Aug 2022 - 2 Sep 2022
ISBN-13: 9781728194271
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/IRMMW-THz50927.2022.9895778
Publisher version: https://doi.org/10.1109/IRMMW-THz50927.2022.989577...
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Crystals, Metasurfaces
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10158202
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