We introduce the concept of multichannel Dynamically Modulated Perfect Absorbers (DM-PAs) which are periodically modulated lossy interferometric traps that completely absorb incident monochromatic waves. The proposed DMPA protocols utilize a Floquet engineering approach which inflicts a variety of emerging phenomena and features: reconfigurability of perfect absorption (PA) for a broad range of frequencies of the incident wave; PA for infinitesimal local losses, and PA via critical coupling with high-Q modes by inducing back-reflection dynamical mirrors.
We introduce the notion of adiabatic state-flip of a Floquet Hamiltonian associated with a non-Hermitian system that it is subjected to two driving schemes with clear separation of time scales. The fast (Floquet) modulation scheme is utilized to re-allocate the exceptional points in the parameter space of the system and re-define the topological features of an adiabatic cyclic modulation associated with the slow driving scheme. Such topological re-organization can be used in order to control the adiabatic transport between two eigenmodes of the Floquet Hamiltonian. The proposed scheme provides a degree of reconfigurability of adiabatic state transfer which can find applications in system control in photonics and microwave domains. PACS numbers:Introduction-The adiabatic theorem of Hermitian quantum mechanics is at the heart of many phenomena with far reaching technological applications. In simple terms it states that when a system described by a (sufficiently) slowly varying Hamiltonian H(t) is initially prepared at a non-degenerate normal mode of H(t = t 0 ), it will remain in the corresponding normal mode of the instantaneous H(t) throughout the evolution. Consequently a cyclic adiabatic change in a multi-parameter space will return the system to its initial state, with possible an overall phase modification -the famous Berry phase. The latter turns out to be insensitive to the specifics of the adiabatic motion and depends only on the choice of the path in the parameter space [1].
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