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SUMMARY:Some recent advances in electromagnetic and flexural wave scatteri
 ng: CPAL and shape recognition - Mohamed Farhat (King Abdullah University 
 of Science and Technology (KAUST))
DTSTART:20230523T103500Z
DTEND:20230523T112000Z
UID:TALK198874@talks.cam.ac.uk
DESCRIPTION:In the first part of this talk\, I will present our recent adv
 ances in the coherent perfect-absorber and laser (CPAL) for electromagneti
 c and elastodynamic waves. This intriguing effect is enabled by parity-tim
 e (PT)-symmetry breaking condition. We first propose to accomplish ultra-s
 ensitivity and robustness to noise by demonstrating a CPAL-locked radiofre
 quency sensor to detect extremely small-scale reactive or conductive pertu
 rbations. The results show that the sensitivity and resolvability of the C
 PAL-locked sensor may go well beyond the traditional rf sensors. Moreover\
 , we extend the concept for flexural waves\, and show that the lasing oper
 ation of CPAL device can first observed theoretically and validated numeri
 cally (3D COMSOL full elasticity simulations) in elastic thin-plates.&nbsp
 \;\nIn the second part\, I will shortly discuss a generative deep learning
  approach for shape recognition of an arbitrary object from its acoustic s
 cattering amplitudes. The model exploits adversarial learning and variatio
 nal inference to predict the unique shape of the object. The nonunique sol
 ution space is overcome by the multiangle and multifrequency phaseless far
 -field patterns.
LOCATION:Seminar Room 1\, Newton Institute
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