BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Coherent perfect absorption and transmission in disordered media -
  Stefan Rotter (Technische Universität Wien)
DTSTART:20230320T133000Z
DTEND:20230320T143000Z
UID:TALK195595@talks.cam.ac.uk
DESCRIPTION:In my talk I will present recent work on the perfect absorptio
 n and transmission of waves through interferometric cancellation of backsc
 attering. In the first case [1]\, we demonstrate how to construct an anti-
 reflection structure for a disordered medium. Similar to an anti-reflectio
 n coating for conventional eye-glasses\, this structure leads to perfect t
 ransmission across the scattering system by suppressing back-scattering fo
 r any incoming wavefront. In the second case [2]\, we demonstrate how to a
 chieve perfect absorption of radiation for the case that an absorber is em
 bedded inside a disordered medium. More recently\, we have extended this c
 oncept to design a device that can turn even a weakly absorbing film into 
 a &ldquo\;coherent perfect absorber&rdquo\; by placing a degenerate cavity
  around it [3]. This special cavity perfectly couples incoming light field
 s with arbitrary wavefronts into the absorber &ndash\; even for the case t
 hat light is a dynamically varying speckle pattern. Successful experimenta
 l implementations have been carried out with the groups of Matthieu Davy\,
  Ulrich Kuhl and Ori Katz.\n[1] M. Horodynski\, M. K&uuml\;hmayer\, C. Fer
 ise\, S. Rotter\, and M. Davy\, Nature 607\, 281 (2022)[2] K. Pichler\, M.
  K&uuml\;hmayer\, J. B&ouml\;hm\, A. Brandst&ouml\;tter\, P. Ambichl\, U. 
 Kuhl\, and S. Rotter\, Nature 567\, 351 (2019)[3] Y. Slobodkin\, G. Weinbe
 rg\, H. H&ouml\;rner\, K. Pichler\, S. Rotter\, and O. Katz\, Science 377\
 , 995 (2022)
LOCATION:Seminar Room 1\, Newton Institute
END:VEVENT
END:VCALENDAR