Tunable Broadband Enhanced Chirality with Hybrid Helical Metamaterials

We experimentally demonstrate and theoretically verify spectrally tunable, extremely large, and ultrabroadband circular dichroism by designing new hybrid nanohelical metamaterial configurations operating at the technologically important visible to ultraviolet spectrum. The demonstrated ultrathin optical metamaterials are expected to provide a substantial boost to the broad fields of classical and quantum optics leading to significantly enhanced chiral light-matter interactions at the nanoscale.