Multiplexing Meta‐Illusion with High Correlation in Both Near‐ and Far‐Field Region

Microwave illusion, which can generate the scattering field of objects that don't exist to deceive the detecting devices, is an important and advanced technology in modern science. The conventional illusion device is limited by the narrow working band, non‐flat structure, or single functionality, which is inconvenient for electromagnetic integration. The newly multiplexing metasurfaces provide an effective method to achieve microwave illusion due to their excellent ability in wavefront tailoring. Here, a dual‐band microwave illusion enabled by multiplexing metasurface is proposed, and such a device can simulate two independent scattering fields of real objects at two separate frequencies by recording the near‐ and far‐field information. As a proof of concept, a meta‐illusion, realizing the electromagnetic information of the scaled‐down Sydney Opera House and Pyramid, is designed and fabricated. Microwave experiments are performed to demonstrate the predicted effects. The results show high correlation properties in both near‐ and far‐field characterizations, which is 83%, 80%, and 91%, 80% at two operating frequencies, respectively, verifying the high performance of the meta‐illusion. The findings may motivate the realizations of high‐performance meta‐illusions in other frequency domains and meta‐devices with complex functionalities. Microwave illusion, which can generate the scattering field of objects that don't exist to deceive the detecting devices. By recording the near‐ and far‐field information calculated from the real objects, the designed metasurface can generate scattered fields of the scaled‐down Sydney Opera House and Pyramid at two respective frequencies and show high correlation.