Optical metasurfaces have driven major advances in imaging, optoelectronics, quantum information, sensing, energy conversion, and optical computing. Dr. Haoran Ren will introduce a multifunctional disordered mosaic metasurface platform, inspired by artistic mosaic patterns. By strategically harnessing structural disorder, we demonstrate a powerful route to dramatically increase metasurface functional density, addressing the longstanding challenge of efficient area utilization. This platform establishes a versatile foundation for compact, high-density, multifunctional photonic devices. He’ll also present their recent metasurface-dressed waveguide circuit for on-chip manipulation of valley information. The valley degree of freedom offers a promising pathway for ultralow-power information processing and quantum technologies, and our demonstration bridges a critical gap in lightwave valleytronics—enabling scalable and integrable valley-based signal processing. He’ll briefly highlight additional applications of metasurfaces in biomedical imaging, wavefront control of quantum emission, and nonlinear and linear angular-momentum holography with increased multi-channel bandwidth.