  Wavefront shaping (WFS) schemes for efficient energy deposition in weakly
lossy targets is an ongoing challenge for many classical wave technologies
relevant to next-generation telecommunications, long-range wireless power
transfer, and electromagnetic warfare. In many circumstances these targets are
embedded inside complicated enclosures which lack any type of (geometric or
hidden) symmetry, such as complex networks, buildings, or vessels, where the
hypersensitive nature of multiple interference paths challenges the viability
of WFS protocols. We demonstrate the success of a new and general WFS scheme,
based on coherent perfect absorption (CPA) electromagnetic protocols, by
utilizing a network of coupled transmission lines with complex connectivity
that enforces the absence of geometric symmetries. Our platform allows for
control of the local losses inside the network and of the violation of
time-reversal symmetry via a magnetic field; thus establishing CPA beyond its
initial concept as the time-reversal of a laser cavity, while offering an
opportunity for better insight into CPA formation via the implementation of
semiclassical tools.
