Fundamental Physics
We pionnered the concept of Topological Metasurfaces for wavefront engineering. Our group is unveiling the fundamental role played by topological singularities in nanophotonics, including phase engineering by encirclying either exceptional points or zero singularities. We made the connection between full phase modulation and crossing of the zero-pole branch cut. We also explained that Huygens Metasurface regime has deep topological origin and is associated to spontaneous symmetry breaking, being surrounded by two exceptional points of coalesced transmission zeros.
Electromagnetic Boundary conditions at arbitrary interfacesWe are developing the concept of CONFORMAL BOUNDARY OPTICS, an analytical method that allows us to engineer transmission and reflection of light for any interface geometry and any given incident wave.
Quantum nanophotonics
We are concerned about the manisfestation and manipulation of quantum effects at nanoscale, including surface plasmon amplification by stimulated emission of radiation in the absence of population inversion on the spasing transitions, the induction of coherence by metasurfaces and the direct measurements of Bell-states using polarization dependent metasurfaces. We prove that metasurfaces hold exciting promise for quantum control of nanophotonic devices.
Numerical methods for Nanophotonics
The operation principles of metaoptics include complex light–matter interactions, often involving insidious near-field coupling effects that are far from being described by classical ray optics calculations. In collaboration with Stéphane Lanteri Group at INRIA, we are developing advanced numerical modeling dedicated to study and design nanophotonics devices. Our work concern recent optimization techniques used in the inverse design of high performance nanophotonics, generalized sheet transition conditions and so forth.
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Applied Research
Metasurfaces and Metalenses
Metasurfaces are generating a lot of excitement in the photonic community as a potential avenue to ultrathin flat optical components.
Metasurfaces integration: VCSELS and LiDARs
Metasurface integration in devices and systems offers unlimited perspectives of applications. We are making significant achievement in LiDARs and VCSELs technologies by leveraging on metasurfaces to achieve large FoV (150°), high framerate (kHz) and simultaneous multi-imaging observations and collimated beaming and laser wavefront shaping. Our approach is unique and prove that metasurfaces can play a leading role in the development of next generation of portable and embedded opto-electronic systems.
See latest LiDAR video here: https://www.youtube.com/channel/UCmezaBH-xOxMjqk3bvqnlAg Nanophotonics and plasmonics
Thin-film optics
Unexpected interferences effects in subwavelength thin films explain the color of anodized metals.
Nonlinear optics
This topic concerns nonlinear optics with nanostructured thin films and pattern formation in broad area VCSELs
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