Multi-angular radiation of electromagnetic waves acting on the site of targeted therapy based on high-bit metamaterials

Encoding metasurface refers to a two-dimensional ultrathin planar array structure in which the unit structure is arranged in a periodic or aperiodic sequence, which can freely manipulate the amplitude, phase and polarization direction of the electromagnetic beam. Based on the generalized Snell's theorem and the far-field scattering theorem, several reflective coding particles are designed to construct high-bit encoding metasurface sequences in the terahertz band. In order to realize the free regulation of the far-field scattering angle of the encoding metasurface, based on the Fourier convolution principle in digital signal processing, we performs addition and subtraction convolution operations on two different reflective encoding metasurface sequences to obtain a new encoding sequence. This coding sequence enables flexible regulation and continuous change of the scattering angle of the terahertz beam.