Microwave edge modes on a metasurface with glide symmetry

Very many congratulations to 3rd year CDT PGR Julia De Pineda Gutierrez for her latest publication on Microwave edge modes on a metasurface with glide symmetry, published in the November edition of Physical Review B. Julia is supervised by Prof A P Hibbins and Prof J R Sambles (FRS). She is currently also representing the 2016 PGR cohort as a member of our Student Advisory Group and works proactively with her peers and the CDT management team to foster a vivid research and training environment for our PhD students and their supervisors.


Figure 7

Figure: Experimental measurement of the fields on top of the sample with the hexagonal shape (left) and the hexagonal hole (right). Both structures have been excited at the top right corner with a loop antenna. The field plots are shown at 21GHz and 25GHz. For both frequencies, only the propagation of the edge mode is supported.


In this work we study planar metasurfaces comprised of two layers of hexagonal arrays of circular metal patches. This two-layer geometry supports a bound surface wave that propagates along the x direction. In our study, each metasurface is infinitely periodic in one direction (x) but only a few periods wide in the orthogonal direction (y). Through experiments and modeling we find evidence of a localized edge mode whose existence is dependent on the relative alignment of the two layers. This edge mode is used to guide the propagation of electromagnetic energy around both triangular and hexagonal shapes.

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