Research on self-assembled gold nanocrystals is being conducted, focusing on their surface plasmon modes. Studies are exploring various aspects, including the enhancement of surface plasmon resonance biosensors, the fabrication of nanostructures, and the effects of morphology on plasmon coupling. The research also involves investigations into the optical modes of plasmonic metasurfaces, the photophysics of artificial light-harvesting nanoantennas, and the self-assembly of gold nanoparticles into supercrystals.