Tunable Graphene Metasurface Reflectarray for Cloaking, Illusion and Focusing
arXiv:1712.04111 · doi:10.1103/PhysRevApplied.9.034021
Abstract
We present a graphene-based metasurface that can be actively tuned between different regimes of operation, such as anomalous beam steering and focusing, cloaking and illusion optics, by applying electrostatic gating without modifying the geometry of the metasurface. The metasurface is designed by placing graphene nano-ribbons (GNRs) on a dielectric cavity resonator, where interplay between geometric plasmon resonances in the ribbons and Fabry-Perot resonances in the cavity is used to achieve 2 phase shift. As a proof of the concept, we demonstrate that wavefront of the field reflected from a triangular bump covered by the metasurface can be tuned by applying electric bias so as to resemble that of bare plane and of a spherical object. Moreover, reflective focusing and change of the reflection direction for the above-mentioned cases are also shown.
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- Reprogrammable Graphene-based Metasurface Mirror with Adaptive Focal Point for THz Imaging
- Reflection and refraction problems for metasurfaces related to Monge-Ampère equations
- Toward Monoatomic-Layer Field Confinement Limit via Acoustic Graphene Plasmons
- Hybrid Si-GST Polarization-Insensitive Dynamically Tunable Bifocal Metalens Operating at 1.55-m Wavelength
- Electromagnetic Illusion in Smart Environments