Perfect absorption in complex scattering systems with or without hidden symmetries

Nature Communications
Lei ChenSteven M Anlage

Abstract

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 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.

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Citations

May 29, 2021·Physical Review Letters·Philipp Del HougneMatthieu Davy
Jun 18, 2021·Physical Review. E·Lei ChenYan V Fyodorov

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Methods Mentioned

BETA
SMA

Software Mentioned

CST ( Computer Simulation Technology ) Studio
CPA
PNA
CST
TOUCHSTONE

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