Wavefront Engineering at Terahertz Frequencies Through Intelligent Reflecting Surfaces

In this paper, the performance criteria, required design, and possible operating modes for IRS at THz frequencies are derived and presented. Due to device constraints, codebooks that can define wavefronts within the near-field may be required for optimal IRS efficiency. Numerical results are provided to benchmark the performance of Bessel beams with conventional beamforming under various communication scenarios, which show that Bessel beam wavefronts have promising applications in next-generation wireless standards at (sub) THz frequencies.