Plasmonics is a field of study that focuses on the interaction between light and metal surfaces at the nanoscale. It involves the excitation of surface plasmons, which are collective oscillations of free electrons in metals. These oscillations can enhance electromagnetic fields, allowing for applications in sensors, imaging, and energy harvesting. The unique properties of plasmonic materials, such as gold and silver, enable them to manipulate light in ways that conventional materials cannot. This capability has led to advancements in various technologies, including photovoltaics, biosensing, and nano-optics, making plasmonics a promising area for future research and development.