Perturbing scattering resonances in non-Hermitian systems: a generalized Wigner-Smith operator formulation

N Byrnes, MR Foreman - arxiv preprint arxiv:2408.11360, 2024 - arxiv.org
Resonances of open non-Hermitian systems are associated with the poles of the system
scattering matrix. Perturbations of the system cause these poles to shift in the complex …

Poles and zeros of the scattering matrix and coherent perfect absorption in tunable reverberating environments

J Lu - 2024 - theses.hal.science
In the thesis, I present experimental results on microwave networks and reverberation
chambers. The general description is based on scattering theory, describing the reflection …