Impact of the evaluation precision of the reaction integrals of the method of moments on the solution of plasmonic problems near the quasi-static regime

The present work digs into some of the accuracy issues the authors have found when dealing with plasmonic problems in the vicinity of quasi-statics, where the dimension of the particles inevitably leads to extremely small mesh sizes to preserve the geometrical features. Obviously, these problems can always be traced back to a certain lack of precision in the evaluation of the reaction integrals, but some light is herein shed as to which term in the impedance matrix each inconsistency can be related to, in addition to some physical insight.