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Intelligent reflecting surface (IRS)-assisted wireless communication iswidely deemed a key technology for 6G systems. The main challenge in deployingan IRS-aided terahertz (THz) link, though, is the severe propagation losses athigh frequency bands. Hence, a THz IRS is expected to consist of a massivenumber of reflecting elements to compensate for those losses. However, as theIRS size grows, the conventional far-field assumption starts becoming invalidand the spherical wavefront of the radiated waves must be taken into account.In this work, we focus on the near-field and analytically determine the IRSresponse in the Fresnel zone by leveraging electromagnetic theory.Specifically, we derive a novel expression for the path loss and beampattern ofa holographic IRS, which is then used to model its discrete counterpart. Ouranalysis sheds light on the modeling aspects and beamfocusing capabilities ofTHz IRSs.

Electromagnetic Modeling of Holographic Intelligent Reflecting Surfaces at Terahertz Bands