Nano-optics is a branch of science that studies how light interacts with materials at the nanoscale, typically at dimensions smaller than the wavelength of light. This field combines principles from optics and nanotechnology to explore phenomena such as light manipulation, enhancement, and localization in tiny structures. Researchers in nano-optics investigate applications like super-resolution imaging, which allows for capturing images at resolutions beyond the diffraction limit of light. Other applications include plasmonics, where light interacts with metal nanoparticles, leading to unique optical properties that can be used in sensors, solar cells, and other advanced technologies.