Work

Nonlinearity-induced scattering zero degeneracies for spectral management of coherent perfect absorption in complex systems

Year: 2024

Type: article

Abstract: We develop a coherent perfect absorption (CPA) protocol for cases where scale invariance is violated due to the presence of nonlinear mechanisms. We demonstrate, using a microwave setting that lacks geometrical symmetries, that the nonlinearity offers new reconfigurable modalities: the destruction or formation of nonlinear CPAs (NL CPAs), and their frequency positioning and bandwidth management using the incident power as a control knob. The latter occurs via the formation of exceptional point degeneracies of the zeros of nonlinear scattering processes. Our results establish NL-CPA protocols as a versatile scheme for the creation of reconfigurable hot or cold spots in complicated enclosures (e.g., buildings or vessels) with applications to next-generation telecommunications, long-range wireless power transfer, and electromagnetic warfare.

Source: Physical Review Applied

DOI: 10.1103/physrevapplied.22.064093

Authors: Cheng-Zhen Wang, John Guillamon, William Tuxbury, Ulrich Kuhl, Tsampikos Kottos

Institutions: Wesleyan University, Centre National de la Recherche Scientifique, Université Côte d'Azur, Institut de Physique de Nice

Language: English

Topic: Quantum Mechanics and Non-Hermitian Physics

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, Simons Foundation, Division of Electrical, Communications and Cyber Systems

Awards: G2254757152, RINGS: Harnessing the Complexity of Modern Electromagnetic Environments for Resilient Wireless Communications, G8700871098