Non-invasive 3D imaging of hidden objects based on a short-wave infrared BIC metasurface

Point-cloud-projection-based stereo vision technology is widely applied in 3D reconstruction, robotic vision, and virtual reality. A metasurface, known for its exceptional light-field manipulation capabilities and compact integration, offers a promising approach to reducing system size while enhancing functionality. In this work, we propose and implement a short-wave infrared 3D structured light detection system based on a metasurface supporting a bound state in the continuum (BIC). The designed BIC metasurface exhibits wavelength selectivity, generating a point cloud projection array exclusively under 1350 nm laser illumination, effectively minimizing interference from environmental light and enabling penetration through certain packaging materials opaque to visible light. Using this system, we successfully demonstrate 3D detection and reconstruction of concealed objects, such as lenses and workpieces, within opaque packaging. Our design provides a non-contact, penetrating 3D reconstruction approach for industrial inspection, offering potential applications in nondestructive quality control.