Anomalies in light scattering
Review article, 2019

The scattering of electromagnetic waves lies at the heart of most experimental techniques over nearly the entire electromagnetic spectrum, ranging from radio waves to optics and x rays. Hence, deep insight into the basics of scattering theory and an understanding of the peculiar features of electromagnetic scattering are necessary for the correct interpretation of experimental data and an understanding of the underlying physics. Recently, a broad spectrum of exceptional scattering phenomena attainable in suitably engineered structures has been predicted and demonstrated. Examples include bound states in the continuum, exceptional points in parity-time (PT)-symmetrical non-Hermitian systems, coherent perfect absorption, virtual perfect absorption, nontrivial lasing, nonradiating sources, and others. In this paper, we establish a unified description of such exotic scattering phenomena and show that the origin of ail these effects can be traced back to the properties of poles and zeros of the underlying scattering matrix. We provide insights on how managing these special points in the complex frequency plane provides a powerful approach to tailor unusual scattering regimes. (C) 2019 Optical Society of America


Alex Krasnok

City University of New York

Denis Baranov

Chalmers, Physics, Bionanophotonics

Huanan Li

City University of New York

Mohammad-Ali Miri

City University of New York

Francesco Monticone

Cornell University

Andrea Alu

City University of New York

Advances in Optics and Photonics

1943-8206 (ISSN)

Vol. 11 4 892-951

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics



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