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TZID:Europe/Paris
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BEGIN:VEVENT
UID:1-63@lptms.universite-paris-saclay.fr
DTSTART:20120911T110000Z
DTEND:20120911T120000Z
DTSTAMP:20120723T105413Z
URL:http://www.lptms.universite-paris-saclay.fr/seminars/seminaire-du-lptm
 s-geoffroy-lerosey/
SUMMARY:Séminaire du LPTMS: Geoffroy Lerosey - LPTMS\, salle 201\, 2ème 
 étage\, Bât 100\, Campus d'Orsay - 11 Sep 12 11:00
DESCRIPTION:A broadband approach to sub-diffraction far field imaging and f
 ocusing with metamaterials\nGeoffroy Lerosey (Institut Langevin\, ESPCI Pa
 risTech &amp\; CNRS UMR 7587)\nIn this talk I will show how the use of tim
 e dependent and broadband wavefields\, in conjunction with metamaterials\,
  permits to beat the diffraction limit from the far field for imaging or f
 ocusing purposes. I will introduce the idea of resonant metalens\, first d
 emonstrated in the microwave domain\, and explain its principles. In parti
 cular\, I will show how the concept of time reversal can be utilized to fo
 cus in this metamaterial based lens and from the far field\, onto focal sp
 ots much smaller than the diffraction limit. I will then prove the general
 ity of the approach by demonstrating its transposition to the acoustic dom
 ain thanks to a very simple setup: an array of soda cans. Then I will pres
 ent our latest theoretical and numerical results obtained using a resonant
  metalens made out of plasmonic nanorods in the visible part of the spectr
 um. I will show that this lens allows\, using polychromatic light\, to foc
 us light using far field time reversal onto spots as small as 1/30th of th
 e wavelength in the visible. Finally I will prove that our approach can al
 so be used in order to image from the far field and with a subwavelength r
 esolution and could lead to real time sub-diffraction imaging systems. \n
LOCATION:LPTMS\, salle 201\, 2ème étage\, Bât 100\, Campus d'Orsay\, 15 
 Rue Georges Clemenceau\, Orsay\, 91405\, France
GEO:48.698185;2.181768
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 me étage\, Bât 100\, Campus d'Orsay:geo:48.698185,2.181768
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