Multifunctional Janus metasurfaces achieving arbitrary wavefront manipulation at dual frequency

Metasurface with simultaneous control of amplitude, phase, and polarization of electromagnetic (EM) waves has drawn great attention in modern optics and photonics. However, conventional metasurfaces are mainly designed for single frequency and functionality. Here, we proposed a simple yet powerful methodology for the design of a dual-frequency multifunctional Janus metasurface. The designed trans-missive device with sub-wavelength thickness is not only able to achieve completely independent phase modulation at two preset frequencies, but can also realize efficient asymmetric transmission of EM waves. On the other hand, the out-of-plane symmetry breaking also enables the realization of different functions for opposite propagation directions. As a proof of concept, a Janus beam deflector and a Janus metalens with direction-and frequency-controlled functionalities are demonstrated numerically. A dual-frequency Janus metasurface for direction-dependent meta-holograms is validated both numeri-cally and experimentally. Therefore, we believe the proposed metasurfaces with direction-and frequency-dependent versatile functionalities may have great potential in the fields such as polarization manipulation, chiral sensing and information encryption.CO 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Automated summary

This study proposes a dual-frequency multifunctional Janus metasurface design method, which can simultaneously control the amplitude, phase, and polarization of electromagnetic waves. By breaking the symmetry, different functionalities are achieved in opposite propagation directions. Numerical simulations and experimental validations demonstrate the application of this metasurface in beam deflection and lens design.