Crystalline Grating-Waveguide Resonant reflectors G. Mourkioti, G.A. Govindassamy, F. Li, R.W. Eason, M. Abdou Ahmed and J.I. Mackenzie EPJ Web Conf., 267 (2022) 02021 Published online: 18 October 2022 DOI: 10.1051/epjconf/202226702021