Photonic Terahertz Wireless Communication Enabled by a Blazed Grating for Frequency-Selective Beam Separation

In future 6G systems, terahertz (THz) waves are expected to be essential for enabling extremely high-capacity wireless communication. For such systems, efficient separation of multiple THz waves is required. A diffraction grating enables simple direct detection. Therefore, we designed a blazed grating optimized for THz beam separation. The grating was fabricated using a low-cost 3D printing process with a conductive coating, resulting in a simple structure that enables effective beam separation. Experimental results confirmed high-efficiency beam separation in the 300 GHz band, and 15 Gbit/s wireless communication was successfully demonstrated under these conditions. These results indicate that the proposed blazed grating provides a promising solution as a practical approach for THz wave receivers in future 6G wireless communication networks.