PhD Position in optical coatings (MSCA-DN TRADES)

id="offer-description" class="ecl-u-type-heading-2 ecl-u-mt-none ecl-u-mb-l">Offer Description Optical interference filters offer a very broad range of optical functions for the control of the spectral properties of light. With the last 15-year improvement of both the design techniques and the manufacturing systems, the complexity of filters has dramatically increased. In particular, the combination of stable deposition processes and in-situ optical monitoring has allowed fabricating high performances filters that can be composed with several hundreds of layers. The filters structures are then no longer periodic and can exhibit a very broad range of thicknesses ranging from a few nanometers to a few hundreds of nanometer for filers in visible and near-IR range. To precisely control the thickness of each layer, there are, as of today, two classes of optical monitoring techniques: monochromatic and broadband optical monitoring. The first one relies on an in-situ measurement of the transmitted (or reflected) intensity at a single wavelength and, in this case, the choice of the proper wavelength is a critical criterion that will affect the precision of the control. The second one relies on an in-situ measurement of the transmitted (or reflected) intensity over a broad spectral range and, in this case, the choice of the proper stopping condition is a critical criterion that will affect the precision of the control. In this thesis, we propose to explore broadband optical monitoring