EXISTENCE OF INVISIBLE NONSCATTERING OBJECTS AND NONRADIATING SOURCES

The radiation that is due to the scattering of an incoming light wave from an object or that is generated by a source distribution is consid ered. It is assumed that the field propagation can be described by the equation of; radiative transport or, in the P-1 approximation, by the diffusion equation. It is shown by explicit examples that there is a class of object (source) distributions that generate scattered (radiat ion) fields that are identically The existence of these invisible obje ct and source distributions leads to serious complications for the inv erse, i.e., the reconstruction, problem. (C) 1997 Optical Society of A merica.