“…Au and Ag, due to their high cost and incompatibility with microelectronic industry fabrication [30,31]. This has prompted extensive research toward alternative plasmonic materials, including heavily doped transparent conductive oxides [32][33][34], non-stoichiometric oxides [35,36], alkalinoble intermetallics [37,38], and the already mentioned TMNs [14-16, 39, 40]. In particular, the combination of critical features of TMNs, such as optical tunability, ease of fabrication and refractory nature, suggests a considerable potential of this material class in the field of plasmonics [41,42].…”