Plasmonic materials are substances that can support surface plasmons, which are coherent oscillations of free electrons at the surface of a metal. These materials typically include metals like gold and silver, known for their ability to interact with light at the nanoscale. This interaction can enhance electromagnetic fields, making plasmonic materials useful in various applications, such as sensors and imaging technologies. The unique properties of plasmonic materials arise from their ability to manipulate light at dimensions smaller than its wavelength. This capability allows for the development of advanced devices in fields like photovoltaics, biomedical imaging, and nanophotonics. Researchers continue to explore new plasmonic materials to improve efficiency and functionality in these applications.