Photonics Research, 2017, 5 (5): 05000441, Published Online: Aug. 31, 2017  

Theoretical study of tunable chirality from graphene integrated achiral metasurfaces Download: 966次

Author Affiliations
Dalian University of Technology, Department of Biomedical Engineering, Dalian 116024, China
Abstract
Control of chirality using metamaterials plays a critical role in a diverse set of advanced photonics applications, such as polarization control, bio-sensing, and polarization-sensitive imaging devices. However, this poses a major challenge, as it primarily involves the geometrical reconfiguration of metamolecules that cannot be adjusted dynamically. Real-world applications require active tuning of the chirality, which can easily manipulate the magnitude, handedness, and spectral range of chiroptical response. Here, enabled by graphene, we theoretically reveal a tunable/switchable achiral metasurface in the near-infrared region. In the model, the achiral metasurface consists of an array of circular holes embedded through a metal/dielectric/metal trilayer incorporated with the graphene sheet, where holes occupy the sites of a rectangular lattice. Circular conversion dichroism (CCD) originates from the mutual orientation between the achiral metasurface and oblique incident wave. The achiral metasurface possesses dual-band sharp features in the CCD spectra, which are tuned over a broad bandwidth by electrically modulating the graphene’s Fermi level. By selecting aluminium as the metal materials, we numerically achieved strong CCD and considerably reduced materials costs with our nanostructures compared with the typically used noble metals such as gold and silver.

Tun Cao, Yang Li, Xinyu Zhang, Yang Zou. Theoretical study of tunable chirality from graphene integrated achiral metasurfaces[J]. Photonics Research, 2017, 5(5): 05000441.

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