Full‐Space Manipulations of Electromagnetic Wavefronts at Two Frequencies by Encoding Both Amplitude and Phase of Metasurface

Abstract

AbstractIn recent years, metasurfaces have not only provided new mechanisms to effectively control the electromagnetic waves but also maintained lower profiles and easy fabrication. Based on metasurfaces, many novel devices and applications have been reported and realized successively. Here, a dual‐band metasurface operating at microwave frequencies to achieve independent manipulations of reflected and transmitted waves in two half‐spaces at two frequencies is proposed. The designed C‐shaped metaparticle consists of two C‐shaped patterns and a C‐shaped slot on three layers, which can modulate both amplitude and phase responses of the reflected and transmitted waves simultaneously by altering the opening and orientation angles at 7 and 17 GHz. The transmission mode works at 7 GHz, in which multifocal points can be formed on focal planes with different distances and intensities using the amplitude and phase modulations. While the reflection mode works at 17 GHz, the reflected beams can be generated and controlled with different intensities in far‐field. All experimental results have good agreements with numerical simulations. This proposed metasurface paves the way for attaining multifunctional metadevices with amplitude and phase modulations in the full space, which have potential applications in imaging and communication systems.