Meta-Optics—Multifunctionality and Neural Computing

In this invited talk, I would like to share with you two pieces of recent work from my lab on meta-optics. In the first part of the talk, I will show you passive multifunctional metasurface devices based on quasi-bound states in the continuum that can produce distinct wavefront shapes at different wavelengths, and active multifunctional metasurface devices made of conventional dielectric materials that can produce distinct wavefronts under different heating conditions. The second part of the talk is about a new class of optical neural networks based on metasurfaces that can transform complex binary and gray-scale images, such as handwritten digits and human facial photos, into “optical barcodes” to enable their identification.