The concept of an active drain has been used recently to provide an optical element which manages to perfectly sink incoming electromagnetic radiation. Here I show that, without prior knowledge of the incoming signal, an element attempting to respond as an active localized drain cannot succeed.
No takes yet. Share an insight, caveat, or question.
Paul Kinsler (2010) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: