University of Birmingham > Talks@bham > Metamaterials Research Group Seminars > Controlling electromagnetic fields with plasmonic metasurfaces: the effect of singularities

Controlling electromagnetic fields with plasmonic metasurfaces: the effect of singularities

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Dr Miguel Navarro-Cia.

Metasurfaces can be formed by structuring a plasmonic surface at the subwavelength scale and yield to richer interactions with external electromagnetic radiation than conventional gratings. In this talk I will discuss how conformal transformation can be used to design metasurfaces, focusing in the case where these transformations have singular points. This gives rise to singular metasurfaces which have continuous spectra rather than the discrete set of peaks characteristic of conventional gratings [1]. I will consider two instances of singular metasurfaces: (i) a metal surface with sharp edges [2] and (ii) a periodically doped graphene layer [3] whose conductivity minimum is smoothly suppressed. I will discuss the transition from a discrete to a continuous spectrum as the singular case is approached, and show how the singular graphene metasurface performs as a broadband THz absorber [4].

[1] J.B. Pendry, P.A. Huidobro, Y. Luo and E. Galiffi, “Compacted dimensions and singular plasmonic Metasurfaces”, Science, 358(6365), 915-917 (2017). [2] F. Yang, P.A. Huidobro, J.B. Pendry, “A transformation optics approach to singular metasurfaces”, Physical Review B 98 (12), 125409 (2018). [3] P.A. Huidobro, M. Kraft, R. Kun, S.A. Maier and J.B. Pendry, “Graphene, plasmons and transformation optics”, Journal of Optics 18, 044024 (2016). [4] E. Galiffi, J. B. Pendry and P.A. Huidobro, “Broadband THz absorption with singular graphene metasurfaces”, ACS Nano, 12 (2), 1006-1013 (2018).

This talk is part of the Metamaterials Research Group Seminars series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.


Talks@bham, University of Birmingham. Contact Us | Help and Documentation | Privacy and Publicity.
talks@bham is based on from the University of Cambridge.