A method for trimming at least one photonic device, and comprising obtaining one or more photonic devices including at least one component for supporting propagation of electromagnetic radiation and a covering layer comprising a polymerisable liquid crystal. The method further comprises determining, for a selected photonic device selected from the one or more photonic devices, a selected liquid crystal orienting condition to be applied to the polymerisable liquid crystal resulting in a preferred value for an electromagnetic property of the selected photonic device. The method also comprises, while applying the selected liquid crystal orienting condition, polymerizing the polymerisable liquid crystal cladding layer of the selected photonic device, thus obtaining a polymerized liquid crystal on the selected photonic device.