Metasurfaces is an emerging technology, poised to disrupt diverse application sectors of the optical industry, including AR/VR, Light imaging and Ranging (LiDAR) and optical design. With respect to conventional diffractive optical elements (DOE), Metasurfaces provide considerably higher scalability, larger field of view (FoV) and enhanced diffraction efficiencies (DE). In addition, their design flexibility allows for arbitrary intensity, phase and polarization far-field distribution. Most of the commercial imaging LiDAR devices rely on light scanning architectures that enforce compromising between FoV and frame rate. Splitting incident power to project a point-cloud of intensity distribution in the far-field, flash LiDAR systems can improve imaging speed, but at the expense of the imaging depth. To overcome these limitations, metasurfaces have been proposed as a good alternative to conventional LiDAR components, for both detection and illumination. However, further efforts in improving design, fabrication and characterization of those functionalized surfaces are still needed. Here, we demonstrate the advantage of design flow based on inverse design capability for the generation of a metasurface targeting advanced beam steering and arbitrary point-cloud illumination for 3D sensing. The development of metasurface-based projectors, able to generate arbitrary light distributions -beyond classical diffraction patterns- would open new LiDAR imaging capabilities with improved resolution and performances.
Metasurfaces are artificial optical interfaces designed to control the phase, the amplitude, and the polarization of an optical wavefront. They use physical mechanisms that rely on the coherent scattering of light by nano-scatterers of various shapes and material compositions. In this presentation, I will talk about on-chip integrations of metasurfaces, including lasers, LiDAR and detector arrays, and discuss how these innovative functionalities push the frontiers of optoelectronic systems beyond conventional devices. I will present new imaging capabilities provided by 3D LiDAR metasystem, emphasizing on the unprecedented performances achieved, in terms of frame rate, field of view and the simultaneous acquisition of multiple field of views. Finally, i will present our results on 3D insect-inspired directional imaging devices. We show that mimicking the peripheral vision of insect using planar metalens arrays, we could measure simultaneously the light coming from several directions to reconstruct 3D images. I will conclude this seminar by drawing perspectives and highlighting the opportunities that this field of research still has to offer, both from fundamental and application.
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