Titanium oxynitride thin films with tuneable double epsilon-near-zero behaviour for nanophotonic applications - Braic, L; Vasilantonakis, N; Mihai, A; Villar-Garcia, I; Fearn, S; Zou, B; Alford, N; Doiron, B; Oulton, R; Maier, S; Zayats, A; Petrov, P (ACS Applied Materials and Interfaces, 2017)