Disorder-enabled pure circular dichroism in bilayer plasmonic metasurfaces

In optical metasurfaces, disorder, e.g. in the arrangement or shape of its building blocks, is usually associated with a deterioration of the optical properties due to an increase of incoherent scattering. However, more recently, researchers have started recognizing the introduction of controlled disorder as a strategy to diversify engineering options of metasurfaces. For example, the introduction of disorder can be used to decrease unwanted anisotropy in their optical response [1] and enhance the information density encoded in wavefront shaping metasurfaces [2].Financial support by the Thuringian State Government within its ProExcellence initiative (ACP2020) and by the German Research Foundation (STA 1426/1-1 and PE 1524/10-1) are gratefully acknowledge