On active drains and causality
Optics
2014-08-04 v3
Abstract
The concept of an \emph{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 respond as an active localized drain cannot succeed.
Cite
@article{arxiv.1008.2088,
title = {On active drains and causality},
author = {Paul Kinsler},
journal= {arXiv preprint arXiv:1008.2088},
year = {2014}
}