Meep negative epsilon. 5 e 6 . extra_materials is a list of materials that Meep should look for in the cell in addition to any materials that are specified by geometric objects. 002i. . How can this be indicated in the material? You can have a negative ε in Meep, but it must be done by introducing a dispersive material. The only problem is a RuntimeWarning and a lot of confusion, because this seems to contradict the statements in the FAQ. Nov 12, 2023 · For copper, for example, in this range dielectric constant is approximately ε ^ = 75 e 3 + i 1. If your material function only returns a nonlinear material, for example, Meep won't notice this unless you tell it explicitly via extra_materials. Meep supports saturable gain and absorbing media through the use of a set of auxiliary equations which model both the polarization and inversion of the saturable medium. I would like to probe a material with a pulse whose frequency has an epsilon = -. Jun 13, 2021 · I wanted to try out using MPB with negative epsilon materials. I have tested the system with an epsilon of 1 and everything works as expected. 3 + . I know it is an "experimental" feature, but I have not even been successful in making the MPB simulation complete, I always get the error RuntimeError: meep: invalid dielectric function for MPB. This is fundamental to Maxwell's equations in the time domain. Dec 2, 2020 · However, If I flip the sign for a negative permittivity, MPB does work again, the simulation finishes and I'm getting correct results. ndex bvtig ekw szgby nvzqi caian jyiso jaen sddiz iqpldcrh