Chiral Waveguides for Robust Waveguiding at the Deep Subwavelength Scale

Abstract

Guiding waves at scales shorter than the wavelength is crucial for many applications, including compact signal-processing systems and concentration of wave energy. High sensitivity to geometrical imperfections and disorder-induced backscattering, however, pose major problems. This study proposes using a chiral metamaterial, in which the waves guided at the subwavelength scale are strongly protected by the chirality against various types of disorder. Through rigorous statistical studies, the authors demonstrate that this scheme is more robust than other waveguiding solutions, including recently proposed topological designs.