Terahertz emission mediated by ultrafast time-varying metasurfaces

Systems with ultrafast time-varying dielectric properties represent an emerging physical framework. We demonstrate here the observation of subcycle dynamics interacting directly with an electromagnetic source comprised of morphologically constrained photoexcited carriers in a surface nanostructure. A transition to a metallic metasurface state occurs on time scales faster than the terahertz-field period, inducing large nonlinear ultrafast phase shifts in the terahertz emission and exposing an interesting physical setting.

Citation

Tunesi, J., Peters, L., Totero Gongora, J. S., Olivieri, L., Fratalocchi, A., Pasquazi, A., & Peccianti, M. (2021). Terahertz emission mediated by ultrafast time-varying metasurfaces. Physical Review Research, 3(4). doi:10.1103/physrevresearch.3.l042006

Sponsors

J.T. acknowledges the support of the Engineering and Physical Sciences Research Council (EPSRC) through Studentship No. EP/N509784/1. J.S.T.G. acknowledges fundingfrom the Leverhulme Trust (Leverhulme Early Career Fellowship No. ECF-2020-537). A.P. acknowledges the support of the Engineering and Physical Research Council (EPSRC), Industrial Innovation Fellowship Programme, under Grant No. EP/S001018/1. This project received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Programme Grant Agreements No. 725046 and No. 851758.

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