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SUMMARY:Electron spectroscopies in the TEM for understanding nano structur
 es and viceversa
DTSTART:20161017T131500
DTEND:20161017T141500
DTSTAMP:20261002T013010Z
UID:730c3b783d0b082b30a2fcda553372899bff40c489b8729524987abf
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Odile Stephan\, Université Paris-Sud - France\nReducing
  the size of materials to induce new properties is at the core of nanoscie
 nce. New physical and chemical effects can emerge from an enhanced (even d
 ominant sometime) contribution of surface or interfacial atoms possessing 
 different electronic configuration than in the bulk\, from the introductio
 n of boundary effects inducing confinement effects of various origin (eith
 er classical or quantum) or due to low dimensionality. Probing such effect
 s at the scale of individual nanostructures requires high spatial resoluti
 on characterisation techniques. Transmission electron microscopy\, which a
 llows combining structural property with optical and electronic property i
 nvestigation down to nanometer or ultimately to atomic scale\, is a most a
 ppropriate tool. In this talk\, relying on recent advances in Electron Ene
 rgy-Loss Spectroscopy (EELS) and nano-Cathodoluminescence (CL) in the Scan
 ning Transmission Electron Microscope (STEM)\, I will explore 3 confinemen
 t mechanisms that play a dominant role in the properties of the nanostruct
 ures or nanotextured materials of interest. These are:  \n\n\n	the occurr
 ence of a 2D electron gas at interfaces of oxide heterostructures and its 
 impact on metal to insulator transition mechanisms\n	the classical confine
 ment of the electromagnetic field associated with localized plasmons in me
 tallic nanoparticles in connection with their optical properties\n	 \n\n\
 n  Such systems\, also happen to be perfect test objects for addressing m
 ore generic questions such as\, how sensitive is EELS to charge spatial di
 stribution? How does light behaves and interact with matter at the nanomet
 er scale and what are the optical observables as accessible by EELS and CL
  [1]?   Finally\, I will push the analogy between photon and fast electro
 n beams by testing the idea of performing quantum nano-optics down to the 
 nanometer (atomic) scale in a transmission electron microscope [2].   [1]
  Extinction and Scattering Properties of High-Order Surface Plasmon Modes 
 in Silver Nanoparticles Probed by Combined Spatially Resolved Electron Ene
 rgy Loss Spectroscopy and Cathodoluminescence N. Kawasaki\, S. Meuret\, R.
  Weil\, H. Lourenço-Martins\, O. Stéphan\, and M. Kociak ACS Photonics\,
  2016\, 3 (9)\, pp 1654–1661 DOI: 10.1021/acsphotonics.6b00257   [2] Br
 ight UV Single Photon Emission at Point Defects in h-BN R. Bourrellier\, S
 . Meuret\, A. Tararan\, O. Stéphan\, M. Kociak\, L. H. G. Tizei\, and A. 
 Zobelli Nano Lett.\, 2016\, 16 (7)\, pp 4317–4321 DOI: 10.1021/acs.nanol
 ett.6b01368\n\nBio: Odile Stéphan is a Professor of physics at University
  Paris-Sud and an honorary member of the Institut Universitaire de France.
  She is currently leading the STEM group at the Orsay Solid State Physics 
 Laboratory. Her research interests span from growth mechanisms to optical 
 and electronic properties of various nanostructures and nanomaterials. She
  focuses on the development and the use of Electron Energy-Loss Spectrosco
 py in a Transmission Electron Microscope and derived innovative spectrosco
 py techniques to probe at the nanometer scale the structural electronic an
 d optical properties of original nanostructures like nanotubes and related
  nanostructures\, nanophotonics objects\, molecular magnets and to explore
  new physics phenomena at low dimensions (plasmon coupling\, electron magn
 etic field confinement and exaltation). She has been awarded the Ancel Pri
 ce of the Physical French Society in 2012 for her achievements in condense
 d matter physics.
LOCATION:SV 1717 https://plan.epfl.ch/?room==SV%201717
STATUS:CONFIRMED
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