Microwave seminar | 23 October 2025

I will showcase the potential of metasurfaces for engineering the dispersion and the mode profile of guided waves through two examples. The first concerns a multiresonant metasurface that is designed to exhibit a purely quadratic spectral phase profile across a (fundamentally) arbitrarily-broad bandwidth. The proposed ultrathin metasurface can fit on a waveguide facet and enable dispersion compensation, chirped pulse amplification, and applications requiring control over the instantaneous frequency (chirp). The second example concerns a parallel-plate waveguide formed by metasurface boundaries which are both electrically and magnetically polarizable. They allow to shape the mode profile from concave, to flat, to convex and enable both superluminal and subluminal propagation, as well as both normal and anomalous group velocity dispersion.

Main paper/arXiv, related to the seminar, and other references

O. Tsilipakos and T. Koschny, “Shaping the Profile and Dispersion of Waves Guided Between Spatiotemporally Dispersive, Electrically and Magnetically Conductive Metasurface Boundaries,” IEEE Transactions on Antennas and Propagation 72(8), pp. 6472-6480, 2024. https://doi.org/10.1109/TAP.2024.3420443

O. Tsilipakos and T. Koschny, “Multiresonant metasurfaces for arbitrarily broad bandwidth pulse chirping and dispersion compensation,” Phys. Rev. B 107, 165408, 2023. https://doi.org/10.1103/PhysRevB.107.165408

O. Tsilipakos, L. Zhang, M. Kafesaki, C. M. Soukoulis, T. Koschny, "Experimental Implementation of Achromatic Multiresonant Metasurface for Broadband Pulse Delay," ACS Photonics 8(6), 1649–1655, 2021. https://doi.org/10.1021/acsphotonics.1c00025

O. Tsilipakos, M. Kafesaki, E. N. Economou, C. M. Soukoulis, T. Koschny, “Squeezing a prism into a surface: Emulating bulk optics with achromatic metasurfaces,” Advanced Optical Materials 8(23), 2000942, 2020. https://doi.org/10.1002/adom.202000942

O. Tsilipakos, T. Koschny, C. M. Soukoulis, “Antimatched Electromagnetic Metasurfaces for Broadband Arbitrary Phase Manipulation in Reflection,” ACS Photonics 5(3), pp. 1101-1107, 2018. https://doi.org/10.1021/acsphotonics.7b01415