Shrinking optical components and systems without compromising performance has been a challenge. An emerging approach is to control incident light’s amplitude, phase, polarization etc. by nanostructures rather than bulky glasses. This spurs the nascent field of flat optics and metasurfaces: a multidisciplinary field that links nanophotonics and optical design. The scope of this topical meeting is to provide a platform for increasing interaction between researchers with nano- or macro-optics expertise for high-end multifunctional optical components.