Research / 2021 / Article / Fig 9

Review Article

Space-Time-Coding Digital Metasurfaces: Principles and Applications

Figure 9

Harmonic information transitions and independent control of dual-harmonic waves. (a) Conceptual illustration of manipulating wave transmission via an STC digital metasurface. Reproduced from [124]. (b) Schematic of independent control of phase states at two frequencies. Reproduced from [124]. (c) Numerically calculated information transition efficiency, pertaining to different lengths of the time-coding sequences and the number of input phase states. Reproduced from [124]. (d) Conceptual illustration of dual-harmonic manipulation based on an STC digital metasurface. Reproduced from [125]. (e) A spiral-like phase distribution at the +1st harmonic frequency and a diagonal gradient distribution at the +2nd harmonic frequency, respectively. Reproduced from [125]. (f) The corresponding combinations of initial phases and time delays. Reproduced from [125]. (g) The corresponding numerically calculated 2D scattering patterns at the +1st and +2nd harmonic frequency, respectively. Reproduced from [125].