Pixelated BIC Metasurfaces for Terahertz Integrated Sensing and Imaging
Conventional terahertz (THz) single-pixel imaging relies on sequential compressed sensing with spatial modulators, imposing severe acquisition latency and hardware complexity. This work demonstrates a parallelized THz single-pixel imaging scheme using a pixelated metasurface within a standard THz time-domain spectroscopy system. Spatial information is encoded through multiple narrow linewidth resonances rooted in bound states in the continuum (BIC) physics, while the BIC-enabled pixelated metasurface facilitates near-field distributed sensing via local field enhancement. A 2×2 metasurface array validates integrated imaging and sensing in a proof-of-concept experiment, with demonstrated scalability to larger arrays. The approach achieves 100% accuracy in binary imaging reconstruction from a single THz pulse and enables refractive index sensing with a sensitivity exceeding 14.39 GHz/RIU. Leveraging the intrinsic penetration capability of THz radiation, this technique offers significant promise for next-generation noninvasive applications such as security inspection and defect detection in semiconductor chips and pharmaceutical products.