Manipulating multiple scattering singularities in generic complex scattering systems with tunable parameters, Part II

We continue the work presented in the previous talk on scattering S-matrix singularities using multiple tunable parameters in microwave cavities that represent generic wave-chaotic systems. The dynamic control of singularity motion in parameter space over multiple mean mode spacings, alongside the abundance of singularities, enables the placement of one at any arbitrary frequency even with a limited tunability. We are further able to experimentally create coincident-in-frequency singularities of different types as each can be moved semi-independently. These composite singularities have unique scattering conditions with physically measurable consequences on the scattering processes of the system. We experimentally demonstrate that at a combined CPA and EP, a generic system can act as a 50:50 In-phase/Quadrature (I/Q) power splitter that is robust to any variation in injected signal magnitude or phase. Further applications of other singularities include minimal wave distortion states, complete absorption of all power injected at a single channel, and multi-channel reflectionless scattering.