  We present a joint experimental and theoretical study of the driven
Su-Schrieffer-Heeger model implemented by arrays of evanescently coupled
plasmonic waveguides. Floquet theory predicts that this system hosts for
suitable driving frequencies a topologically protected edge state that has no
counterpart in static systems, the so-called anomalous Floquet topological
$\pi$-mode. By using real- and Fourier-space leakage radiation microscopy in
combination with edge- and bulk excitation, we unequivocally identify the
anomalous Floquet topological $\pi$-mode and study its frequency dependence.
