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(a) The PER spectrum in dB units showing the efficiency of circular polarization conversion. The contour plot shows the path traversed by locus tip of electric field vector in time at (b) 1.15 THz and (c) 1.46 THz frequencies. (d)–(e) Electric field distributions showing the chirality of the surface plasmon based currents. The reversible time varying current orientation can be seen in the accompanying supplementary materials.
