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Applied optics and Polarimetry

 
 
Our activity has been focused on two essential subjects: Mueller polarimetry and Raman spectroscopy in near field, or “nano-Raman” and their application to various fields (microelectronics, nanomaterials, biomedical).
 
More specifically, for Mueller polarimetry we have investigated:
  • The fundamentals of Mueller polarimetry, which constitutes a research field of its own and may be of paramount importance for the physical interpretation of the experimental data.
  • Instrumental developments. This is our other “core competency” which allowed us to develop a variety of Mueller polarimeters, featuring either spectral of spatial resolution, an suitable for different applications.
  • Metrology of periodic structures. The purpose is to reconstruct the profiles of simple or pairs of superimposed gratings from polarimetric measurements with spectral or angular resolution. This metrological challenge is a very hot topic for the microelectronics industry, and more specifically for process control.
  • Biomedical diagnostics. Here the idea is to use the contrasts observed in polarimetric imaging, which are different from those seen in ordinary intensity imaging, to develop new optical diagnostics, based on tissue scattering and anisotropy properties.
  • Other characterizations and simulations. We have also been involved in other characterization and optical modeling activities, on various samples, such as low emission glass panels, solar cells, nanowires, nanotubes simulating real forests for polarimetric bistatic radar measurements, or natural photonic structures (beetles, butterflies…)
The activity on NanoRaman has been essential about:
  • The development and optimization of TERS (Tip Enhanced Raman Spectroscopy) and related techniques, such as photoluminescence (PL) and electroluminescence (EL), with optimal use of the light polarization, based on the largely recognized expertise of LPICM in this area.
  • To tackle well-identified or promising topics, both fundamental or applied, for which TERS and PL are well suited, a quickly developing research field.
  • To provide advanced characterization of nanomaterials and structures such as carbon nanotubes, graphene, silicon nanowires, and the like…) elaborated by other groups from LIPCM, or other labs within Polytechnique (PMC, LSI) or outside (IEF, Orsay..).