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Electromagnetic metasurfaces (MSs) present a challenge for modelling and numerical simulations, as they are inherently "multi-scale". Thus, equivalent models-namely zero-thickness sheets described by surface susceptibilities-are usually employed for numerical simulations. At the same time, space-time varying media have received interest in the past years due to the exciting phenomena they facilitate (e.g. non-reciprocity). This thesis primarily considers the intersection of these two researchdoi:10.22215/etd/2021-14796 fatcat:nyicbgm635athbokg26bxdsgwy