Plasmonic refers to the study and application of plasmons, which are collective oscillations of free electrons in materials, typically metals. These oscillations can occur when light interacts with the surface of a metal, leading to enhanced electromagnetic fields. This phenomenon is particularly useful in fields like nanotechnology and optics. Plasmonic materials, such as gold and silver, can manipulate light at the nanoscale, enabling advancements in sensors, imaging, and energy harvesting. By controlling plasmons, researchers can develop devices that improve the efficiency of solar cells or enhance the sensitivity of biosensors, making plasmonics a promising area of scientific research.