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The science of light's behavior, acting neither as a particle nor a wave


  • Microwave photonics - the generation, transmission and manipulation of microwaves
  • Photochromism - the reversible transformation of a chemical species between two forms by the absorption of electromagnetic radiation
  • Photoluminescence - or PL, a process in which a substance absorbs photons and then re-radiates photons
  • Photothermal effects - the production of thermal energy produced by the photoexcitation of materials
  • Radiative recombination - the process by which an ion binds an electron to produce a new state with subsequent radiation of photons
  • Spontaneous emission - the process by which a light source undergoes a transition to a state with a lower energy and emits a photon