Surface Lattice Resonances (SLRs) found in uniform plasmonic metasurfaces feature high Q-factors, enabling applications in sensing and nanolasing. To scale up their production, we introduce the Capillary-force-Assisted Particle Assembly method (CAPA). It allows to assemble colloidal nanoparticles onto patterned templates. We demonstrate large hexagonal and square lattices comprised of single-crystal Ag nanoparticles with high quality SLRs. They can be excited into optomechanical oscillations which modulate the LSPR and in turn the SLR over time, giving the metasurface intriguing properties in the ultrafast regime. Moreover, we tailored the SLR to match the excitation wavelength used in Raman spectroscopy. This allowed to create SERS substrates with improved performance, achieving 100 times higher sensitivity at the target wavelength. Finally, we interfaced plasmonic metasurfaces with gain media and registered room temperature nanolasing. The demonstrated applications showcase the versatility of CAPA and we expect self-assembly to play a major role in the development of large scale metasurfaces and nanophotonics devices.
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