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We derive and discuss general physical bounds on the electromagneticscattering and absorption of passive structures. Our theory, based on passivityand power conservation, quantifies the minimum and maximum allowed scatteringfor an object that absorbs a given level of power. We show that there is afundamental trade-off between absorption and overall scattering suppression foreach scattering harmonic, providing a tool to quantify the performance offurtive sensors, regardless of the applied principle for scatteringsuppression. We illustrate these fundamental limitations with examples of lightscattering from absorbing plasmonic nanoparticles and loaded dipole antennas,envisioning applications to the design of cloaked sensors and absorbers withmaximized absorption efficiency.

Physical Bounds on Absorption and Scattering for Cloaked Sensors