Laser sintering of high-resolution nanostructured optical metasurfaces

Laser direct writing has been extensively explored for the fabrication of nano-optical devices. Achieving high-resolution often requires ultrafast lasers. Here, we report a high-resolution and cost-effective laser sintering strategy for the direct writing of plasmonic optical metasurfaces. This approach enables highly localized laser sintering of metal nanoparticles. A laser-driven photochemical reaction model is proposed to explain and predict the nanoscale sintering behavior. Finally, we demonstrate a range of functional metasurface nanostructures.