Field emission yana nufin wani al’amari inda ake fitar da electrons daga saman wani abu idan aka shafa masa wuta mai ƙarfi. Fitarwar tana faruwa ne lokacin da ƙarfin wutar lantarki a saman kayan ya wuce wani ƙayyadadden ƙira, wanda ake kira "Ƙarfin filin" ko "Fowler-Nordheim barrier". Za a iya ƙara haɓakawa da mayar da hankali ga na'urorin lantarki da aka fitar don ƙirƙirar katako mai haɗakarwa sosai, wanda ke da amfani a aikace-aikace iri-iri, kamar microscopy na electron, nazarin sararin samaniya, da binciken kimiyyar lissafi.