Comparative Analysis of Ethanol Gas Sensors Based on Bloch Surface Wave and Surface Plasmon Resonance João P.M. Carvalho, Miguel A.S. Almeida, João P. Mendes, Luís C.C. Coelho and José M.M.M. De Almeida EPJ Web Conf., 305 (2024) 00016 Published online: 15 October 2024 DOI: 10.1051/epjconf/202430500016