title: Far-infrared bandpass filters from perforated metal screens.
abstract: Precision nickel printing screens are shown to be very useful as far-infrared bandpass filters. For a range of such regularly perforated sheets, transmission peaks of ~ 0.9 have been observed to lie at frequencies between 60 and 140 cm(-1). We found that this value shows little degradation by cascading several screens, but the overall filter Q value may be increased from 2.7 to a value of ~ 6. These screens have considerable advantages over conventional far-infrared bandpass filters in terms of strength, optical characteristics, and cost.
authors.forename: P G
authors.initials: PG
authors.lastname: Huggard
authors.forename: M
authors.initials: M
authors.lastname: Meyringer
authors.forename: A
authors.initials: A
authors.lastname: Schilz
authors.forename: K
authors.initials: K
authors.lastname: Goller
authors.forename: W
authors.initials: W
authors.lastname: Prettl