Magnetic Field Enhanced Frequency‐Selective Terahertz Detection via 3D Printing Micro‐Helical Stepped and MoTe₂ Coated Arrays

Abstract Recent advancements in wireless communication have markedly increased data throughput and decreased latency in progressing toward sixth‐generation (6G) networks, wherein the terahertz (THz) waveband offers significant potential. However, conventional THz sensors often suffer from high noise, low responsivity, and low spectrum efficiency, limiting their effectiveness for THz applications. Here, to address these challenges, a magnetic‐enhanced frequency‐selective is developed THz sensor by depositing an Au‐enhanced active layer of MoTe₂ on a designed 3D printing high‐depth micro‐helical stepped structure. This sensor, featuring four characteristic frequency points and an effective area of 107.12 mm², demonstrated noticeable improvements under a 0.145 mT magnetic field at 0.1 THz: optical responsivity improved by 413.23% (from 3.32 to 17.03 MV W⁻¹), noise equivalent power decreased by 80.51% (from 49.16 to 9.58 pW Hz^−1/2), and the detectivity reached 3.30 × 10¹⁰ cm·Hz^1/2·W⁻¹. This work highlights the potential of integrating 3D microstructures with novel topological materials for practical 6G communication.