Theoretical study of tunable chirality from graphene integrated achiral metasurfaces

• DOI: 10.1364/prj.5.000441
• Publication Date: 2017-08-31T21:52:49Z
• Authors: Tun Cao; Yang Li; Xinyu Zhang; Yang Zou
• Keywords: Chirality

Control of chirality using metamaterials plays a critical role in diverse set advanced photonics applications, such as polarization control, bio-sensing, and polarization-sensitive imaging devices. However, this poses major challenge, it primarily involves the geometrical reconfiguration metamolecules that cannot be adjusted dynamically. Real-world applications require active tuning chirality, which can easily manipulate magnitude, handedness, spectral range chiroptical response. Here, enabled by graphene, we theoretically reveal tunable/switchable achiral metasurface near-infrared region. In model, consists an array circular holes embedded through metal/dielectric/metal trilayer incorporated with graphene sheet, where occupy sites rectangular lattice. Circular conversion dichroism (CCD) originates from mutual orientation between oblique incident wave. The possesses dual-band sharp features CCD spectra, are tuned over broad bandwidth electrically modulating graphene’s Fermi level. By selecting aluminium metal materials, numerically achieved strong considerably reduced materials costs our nanostructures compared typically used noble metals gold silver.