Multi-mode optical absorber and sensor based on quasi-bound states in the continuum formed in double-layer metasurfaceYuanyuan Lin, Xiongjun Shang, Cheng Peng and Danqi LiangEur. Phys. J. D, 80 2 (2026) 14DOI: https://doi.org/10.1140/epjd/s10053-026-01127-w