Quadriwave lateral shearing interferometry appears as a powerful tool for metrology in Nanophotonics, for characterization of nanoparticles, 2D-materials and metasurfaces.

Studying the organisation of living matter
Principal investigator: Loic Le Goff, Manos Mavrakis
keywords: cytoskeletal filaments, Drosophila, cell division, morphogenesis, tissue growth, mechanics
More on Manos Mavrakis’ research More on Loïc Le Goff’s research
We are interested in how animal cells and tissues generate, maintain and adapt their shape as they grow, divide and reorganize during physiological responses. Our work aims at providing insights into (1) the interplay (...)

Principal investigator: Miguel A. Alonso
Keywords: polarization, SEO, q-plate, shearing interferometry, birefringence, scatterometry.
This work involves the measurement of nanostructures by using light with tailored polarization distributions, the measurement of the phase of light by using polarization-modifying optical elements, and the measurement of the polarization of light. These measurements are based on the use of spatially-varying birefringent optical elements such as (...)

Principal investigator: Miguel A. Alonso
Keywords: imaging; optical performance, mid-spatial frequency error, Strehl ratio, OTF, PDPD, ray-based methods, Wigner function.
The performance of imaging systems is hindered by manufacturing errors in the optical elements involved. These errors can be the standard aberrations, but also finer-scale imperfections known as mid-spatial frequency errors, resulting from the manufacturing/finishing process, particularly if sub-aperture tools are (...)

Principal investigator: Miguel A. Alonso
Keywords: partial coherence, polarization, Wigner function, Ambiguity function, entanglement.
This work includes theoretical and experimental studies of correlations between optical fields at different points (spatial coherence), at different times (temporal coherence), or for different field components (polarization). At the theoretical level, different formalisms are proposed for modeling partially coherent light, including phase space (...)

Principal investigator: Miguel A. Alonso
Keywords: structured light, propagation-invariant beams, birefringence, geometric phase, nonparaxial light, spin-orbit interaction, Mie scattering.
This work involves the study of optical fields whose spatial and/or temporal structure in amplitude, phase and/or polarization is tailored to present a specific set of properties. One such class of fields are the “propagation-invariant beams”, whose intensity profile is preserved under propagation up (...)

Principal investigator: Thomas Chaigne
There is currently no technique to image neuronal activity with cellular resolution (∼ 10 µm), with large fields of view (∼ 1 cm ) deep inside the brain (> 1 mm), while resolving single action potentials (∼ 1 ms). Most efforts are devoted to scaling up multi-photon fluorescence microscopy to image increasingly larger and deeper populations of neurons, but these techniques are inherently limited by light scattering to shallow depths. So we add (...)

for biosensing and imaging
Principal investigator: Hervé Rigneault
keywords: nonlinear endoscope, lensless endoscope, wavefront shaping, micro-structured optical fibers, Raman probes
We are interested in extending molecular spectroscopy and nonlinear imaging through flexible fiber probes and endoscopes. Using specially design micro-structured fibers, we are investigating (1) the use of hollow core photonic crystal fibers for flexible nonlinear imaging endoscopes and Raman probes. (...)

Principal investigator: Julien Duboisset
Key words: Coherent anti-Stokes Raman scattering, spontaneous Raman, polarization, molecular order, vibrational modes.
We are particularly interested in investigate the molecular vibration for biological imaging and fundamental nonlinear spectroscopy. We develop method based on spontaneous Raman and coherent Raman scattering to directly image the symmetry of molecules in crystals and biological tissues, based on irreducible tensor formalism. (...)

Principal investigators: Hervé Rigneault, Sandro Heuke, Sophie Brasselet, Julien Duboisset
keywords: 2-photon fluorescence, second and third harmonic generation, coherent Raman scattering, pump-probe, nonlinear imaging, molecular spectroscopy
We are interested in how nonlinear optical contrast mechanisms can provide novel molecular information in microscopy and micro-spectroscopy. These modalities take advantage of label free capabilities, deep penetration into scattering samples, as (...)