Broadband Control of Topological Nodes in Electromagnetic Fields

We study topological nodes in electromagnetic wave interactions with structures. We show that, when the nodes exist, it is possible to bind certain nodes to a mirror plane in the structure. Such binding does not rely on any resonances in the structure, thus is effective over a wide wavelength range. As an implication of such broadband binding, we demonstrate that the topological nodes can be used for hiding of metallic objects over a broad wavelength range.