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SUMMARY:Enlightening electrons: detecting and injecting light in a TEM
DTSTART:20220728T140000
DTEND:20220728T153000
DTSTAMP:20260502T203152Z
UID:2321abda3d540fa2301c96af61246dc40ac5867d4bf8d81a9994a80d
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Mathieu Kociak\, Laboratoire de Physique des Solides\, CN
 RS/Université Paris Saclay\, Orsay\, France\nUsing free electrons\, such 
 as those generated in a transmission or scanning electron microscope\, to 
 study the optical and physical properties of materials is not new. Indeed\
 , in the past\, techniques such as cathodoluminescence (CL) have been used
  in scanning electron microscopes (SEMs) or electron energy loss spectrosc
 opy (EELS) in transmission electron microscopes (TEMs)\, respectively to t
 race the emission properties or the dielectric constant of bulk materials.
 \nHowever\, the field has undergone a rather radical change in the last 15
  years\, thanks to remarkable technological advances. We can mention the c
 onstant improvement of the spectral resolution in EELS\, the arrival of in
 creasingly more sensitive CL detectors\, the development of time-resolved 
 techniques or the possibility of injecting light into a microscope. These 
 advances have been accompanied by conceptual ones\, such as the introducti
 on of concepts previously reserved for optics or quantum optics (electroma
 gnetic local density of state\, temporal autocorrelation function\, Rabi o
 scillations ... ) to describe optical experiments with free electrons.\nIn
  this talk\, I will discuss the use of a light injection and detection sys
 tem in a TEM. I will try to highlight the advantages and disadvantages of 
 such a system when it is used for CL\, compared to a CL system installed i
 n a SEM. I will insist on the study of materials\, in particular for optic
 s or quantum optics\, on the understanding of the electron-matter interact
 ion when this technique is coupled with EELS\, as well as the perspectives
  in particular for bio-microscopy and for time-resolved TEM.\nI will also 
 introduce light injection in TEM and in particular its advantage to perfor
 m the recently developed electron energy gain spectroscopy. I will show ho
 w such a system can break\, by several orders of magnitude\, the limits in
  terms of spectral resolution imposed by even the best monochromator techn
 ology.
LOCATION:https://epfl.zoom.us/j/2019908135
STATUS:CONFIRMED
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