Lub thiaj li hu ua nqaim-band lim yog subdivided los ntawm band-pass lim, thiab nws cov ntsiab lus yog tib yam li cov band-pass lim, uas yog, lub lim tso cai rau cov teeb liab optical hla mus rau hauv ib qho kev wavelength band, thiab deviates los ntawm band-pass lim.Cov teeb liab kho qhov muag ntawm ob sab yog thaiv, thiab cov passband ntawm lub lim nqa nqaim yog qhov nqaim, feem ntau tsawg dua 5% ntawm tus nqi nruab nrab wavelength.
Lub luag haujlwm tseem ceeb ntawm qhov nqaim-band lim yog kom dhau lub teeb ntawm ib lub wavelength tshwj xeeb thiab cuam tshuam (lossis attenuate) cov khoom siv kho qhov muag ntawm lub teeb ntawm lwm cov wavelengths.Qhov dav ib nrab nthwv dej feem ntau yog tswj hwm ntawm 20nm lossis tsawg dua, thiab tuaj yeem siv rau hauv ultraviolet, pom lub teeb, ze-infrared wavelengths, thiab far-infrared bands.Peb lub tuam txhab cov ntxaij lim dej nqaim yog tsim los ntawm high-vacuum evaporation ntawm ntau txheej txheej tawv thiab ion-pab deposition ntawm nanomaterials.Zoo compactness thiab siab imaging txhais.