The article "Roadmap for Optical Metasurfaces" by Arseniy I. Kuznetsov et al. provides a comprehensive overview of the current state and future directions of metasurface research. Metasurfaces, which are artificial materials composed of light-scattering nanostructures, have gained significant attention due to their unique functionalities in imaging, beam forming, holography, polarimetry, and more. Despite extensive research, the field continues to expand into adjacent areas such as computational imaging, augmented reality, automotive, display, biosensing, and quantum optics. The article highlights the scientific and industrial impact of metasurfaces, emphasizing their potential for both scientific excellence and broad industrial adoption. The roadmap is structured into seventeen sections, covering various aspects of metasurface technology. It begins with an introduction to the history and development of metasurfaces, followed by detailed discussions on specific applications such as meta-lenses, computational imaging, tunable metasurfaces, and emerging material platforms. The article also addresses challenges and future goals, suggesting directions for research and development to enhance the capabilities of metasurfaces. Key sections include: 1. **Meta-Lenses**: Discusses the current state, concepts, practical implementations, and applications of meta-lenses, including focusing, imaging, sensing, polarization detection, and nonlinear generation. 2. **Metamaterials for Picophotonics**: Explores the use of metamaterials for super-resolution metrology and imaging, focusing on superoscillations and their applications in picophotonics. 3. **Flat Optics Beyond Lenses**: Covers the multifunctionality of metasurfaces, including holograms, polarization control, and spectral amplitude control, and their potential in advanced imaging and display technologies. 4. **Spectral Amplitude Control**: Focuses on the future of color coatings, high-density information carriers, and miniaturized spectrometers and displays, highlighting the advantages of nanophotonic structural colors over traditional colorants. The article emphasizes the importance of integrating metasurfaces with other optical components and leveraging advanced technologies like machine learning and inverse design to enhance their performance and functionality. It also discusses the need for addressing fundamental limitations and optimizing design procedures to maximize transmission and efficiency in multi-layered metasurface systems.The article "Roadmap for Optical Metasurfaces" by Arseniy I. Kuznetsov et al. provides a comprehensive overview of the current state and future directions of metasurface research. Metasurfaces, which are artificial materials composed of light-scattering nanostructures, have gained significant attention due to their unique functionalities in imaging, beam forming, holography, polarimetry, and more. Despite extensive research, the field continues to expand into adjacent areas such as computational imaging, augmented reality, automotive, display, biosensing, and quantum optics. The article highlights the scientific and industrial impact of metasurfaces, emphasizing their potential for both scientific excellence and broad industrial adoption. The roadmap is structured into seventeen sections, covering various aspects of metasurface technology. It begins with an introduction to the history and development of metasurfaces, followed by detailed discussions on specific applications such as meta-lenses, computational imaging, tunable metasurfaces, and emerging material platforms. The article also addresses challenges and future goals, suggesting directions for research and development to enhance the capabilities of metasurfaces. Key sections include: 1. **Meta-Lenses**: Discusses the current state, concepts, practical implementations, and applications of meta-lenses, including focusing, imaging, sensing, polarization detection, and nonlinear generation. 2. **Metamaterials for Picophotonics**: Explores the use of metamaterials for super-resolution metrology and imaging, focusing on superoscillations and their applications in picophotonics. 3. **Flat Optics Beyond Lenses**: Covers the multifunctionality of metasurfaces, including holograms, polarization control, and spectral amplitude control, and their potential in advanced imaging and display technologies. 4. **Spectral Amplitude Control**: Focuses on the future of color coatings, high-density information carriers, and miniaturized spectrometers and displays, highlighting the advantages of nanophotonic structural colors over traditional colorants. The article emphasizes the importance of integrating metasurfaces with other optical components and leveraging advanced technologies like machine learning and inverse design to enhance their performance and functionality. It also discusses the need for addressing fundamental limitations and optimizing design procedures to maximize transmission and efficiency in multi-layered metasurface systems.