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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Coherent perfect absorption and transmission in di
 sordered media - Stefan Rotter (Technische Univers
 ität Wien)
DTSTART;TZID=Europe/London:20230320T133000
DTEND;TZID=Europe/London:20230320T143000
UID:TALK195595AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/195595
DESCRIPTION:In my talk I will present recent work on the perfe
 ct absorption and transmission of waves through in
 terferometric cancellation of backscattering. In t
 he first case [1]\, we demonstrate how to construc
 t an anti-reflection structure for a disordered me
 dium. Similar to an anti-reflection coating for co
 nventional eye-glasses\, this structure leads to p
 erfect transmission across the scattering system b
 y suppressing back-scattering for any incoming wav
 efront. In the second case [2]\, we demonstrate ho
 w to achieve perfect absorption of radiation for t
 he case that an absorber is embedded inside a diso
 rdered medium. More recently\, we have extended th
 is concept to design a device that can turn even a
  weakly absorbing film into a &ldquo\;coherent per
 fect absorber&rdquo\; by placing a degenerate cavi
 ty around it [3]. This special cavity perfectly co
 uples incoming light fields with arbitrary wavefro
 nts into the absorber &ndash\; even for the case t
 hat light is a dynamically varying speckle pattern
 . Successful experimental implementations have bee
 n carried out with the groups of Matthieu Davy\, U
 lrich Kuhl and Ori Katz.\n[1] M. Horodynski\, M. K
 &uuml\;hmayer\, C. Ferise\, S. Rotter\, and M. Dav
 y\, Nature 607\, 281 (2022)[2] K. Pichler\, M. K&u
 uml\;hmayer\, J. B&ouml\;hm\, A. Brandst&ouml\;tte
 r\, P. Ambichl\, U. Kuhl\, and S. Rotter\, Nature 
 567\, 351 (2019)[3] Y. Slobodkin\, G. Weinberg\, H
 . H&ouml\;rner\, K. Pichler\, S. Rotter\, and O. K
 atz\, Science 377\, 995 (2022)
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:
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