Testing the accuracy and convergence of scattering calculations using Lorentz reciprocity

We present a simple and versatile approach to test the accuracy of scattering calculations. Based on the Lorentz reciprocity relation, this criterion can be used for any scattering object, especially where a reference solution (e.g. from Mie theory) does not exist. Application examples with arbitrary shape scatterers in plasmonic metals and high-index dielectrics numerically demonstrate the suitability of the technique, which can be utilized with any numerical method to increase the accuracy of the produced results. (c) 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement