Rotter, S. (2023, March 20). Coherent perfect absorption and transmission in disordered media [Conference Presentation]. Theory of wave scattering in complex and random media, Cambridge, United Kingdom of Great Britain and Northern Ireland (the).
Theory of wave scattering in complex and random media
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Event date:
20-Mar-2023 - 24-Mar-2023
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Event place:
Cambridge, United Kingdom of Great Britain and Northern Ireland (the)
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Keywords:
Wave scattering; Complex optics
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Abstract:
In my talk I will present recent work on the perfect absorption and transmission of waves through interferometric cancellation of backscattering. In the first case [1], we demonstrate how to construct an anti-reflection structure for a disordered medium. Similar to an anti-reflection coating for conventional eye-glasses, this structure leads to perfect transmission across the scattering system by suppressing back-scattering for any incoming wavefront. In the second case [2], we demonstrate how to achieve perfect absorption of radiation for the case that an absorber is embedded inside a disordered medium. More recently, we have extended this concept to design a device that can turn even a weakly absorbing film into a “coherent perfect absorber” by placing a degenerate cavity around it [3]. This special cavity perfectly couples incoming light fields with arbitrary wavefronts into the absorber – even for the case that light is a dynamically varying speckle pattern. Successful experimental implementations have been carried out with the groups of Matthieu Davy, Ulrich Kuhl and Ori Katz.
[1] M. Horodynski, M. Kühmayer, C. Ferise, S. Rotter, and M. Davy, Nature 607, 281 (2022) [2] K. Pichler, M. Kühmayer, J. Böhm, A. Brandstötter, P. Ambichl, U. Kuhl, and S. Rotter, Nature 567, 351 (2019) [3] Y. Slobodkin, G. Weinberg, H. Hörner, K. Pichler, S. Rotter, and O. Katz, Science 377, 995 (2022)
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Research facilities:
Vienna Scientific Cluster
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Project title:
Wellenkontrolle in Systemen mit Absorption und Unordnung: P 32300-N27 (FWF Fonds zur Förderung der wissenschaftlichen Forschung (FWF))