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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Wave localisation in high-contrast media - Bryn Da
 vies (Imperial College London)
DTSTART;TZID=Europe/London:20230321T100000
DTEND;TZID=Europe/London:20230321T103000
UID:TALK195622AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/195622
DESCRIPTION:High-contrast particulate media are an attractive 
 platform for microscopic wave control\, thanks to 
 their ability to support resonance at subwavelengt
 h scales. We have developed an asymptotic method f
 or characterising these high-contrast scattering p
 roblems\, which uses boundary integral representat
 ions to derive a characterisation of subwavelength
  resonance in terms of eigenstates of the generali
 sed capacitance matrix (GCM). The GCM provides a c
 oncise framework to explore some of the important 
 applications and exotic phenomena related to these
  materials. We will use this framework to show tha
 t introducing perturbations to periodic structures
  creates localised eigenmodes. We will see that th
 ese localised modes in large but finite-sized stru
 ctures converge to those in infinite structures. F
 urther\, we will characterise the coupling between
  multiple localised modes and observe a possible m
 echanism for the onset of Anderson localisation in
  random media. These results are collaborations wi
 th Habib Ammari and Erik Orvehed Hiltunen.
LOCATION:Seminar Room 1\, Newton Institute
CONTACT:
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