Graphene-based Pancharatnam-Berry phase metasurface in the terahertz domain for dynamically independent amplitude and phase manipulation

Abstract

Dynamic and independent amplitude and phase manipulation are the paramount demand for many advanced wavefronts engineering applications. Currently, the coupling issue between the amplitude and phase hinders the efficient modulation wavefront’s further implementation. This paper proposes and numerically demonstrates the bi-layer stacked graphene Pancharatnam–Berry (P–B) phase metasurface and mono-layer graphene P-B phase metasurface to address the above problem. The simulation results show that the proposed models can achieve the independent control amplitude and phase and significantly reduce their coupling strength. Our findings offer a flexible and straightforward method for precise wave reconstruction applications such as holography, optical tweezers, and high-resolution imaging.

Revolutionizing optical wireless communication with silicon-based spin-encoded metalens

“…We have simulated a 60 µm × 60 µm all-silicon spin-encoded metalens for the NIR spectrum at 1550 nm wavelength. The designed metalens is polarization insensitive and used the Pancharatnam-Berry (PB) phase [52][53][54] to attain the required phase profile (0 − 2𝜋) by rotating the nano-bars from (0 − 𝜋).…”