Design and analysis of a photonic crystal fiber sensor for highly toxic gases detectionMohammad Abrar Nasif, Farhan Shahriyar, Md Mujahid Hossain, Abdul Gafur and Rakibul HasanEur. Phys. J. Plus, 140 1 (2025) 22DOI: https://doi.org/10.1140/epjp/s13360-025-05967-0