title: Annular-slot arrays as far-infrared bandpass filters.
abstract: Arrays of both annular and square annular slots in a conducting sheet on a dielectric substrate have been fabricated photolithographically. The structures are shown to behave as bandpass filters in the far infrared, with a resonant wavelength slightly larger than the average circumference or perimeter of the slot. The measured far-infrared transmittance of the annular array is approximately 76% of that predicted by theory, while its resonant frequency agrees with theory to within 5%.
authors.forename: P A
authors.initials: PA
authors.lastname: Krug
authors.forename: D H
authors.initials: DH
authors.lastname: Dawes
authors.forename: R C
authors.initials: RC
authors.lastname: McPhedran
authors.forename: W
authors.initials: W
authors.lastname: Wright
authors.forename: J C
authors.initials: JC
authors.lastname: Macfarlane
authors.forename: L B
authors.initials: LB
authors.lastname: Whitbourn