Terahertz spectrum-based refractive index sensor for brain lesion detection using photonic crystal fibers - Md. Naimur Rahman Naim; Jabin Tasnin Upoma; A. H. M. Iftekharul Ferdous; Kayab Khandakar; Md. Golam Sadeque; Md. Sohel Rana (PLoS ONE, 2025)