Annular-slot arrays as far-infrared bandpass filters.
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%.
Krug
P A
PA
Dawes
D H
DH
McPhedran
R C
RC
Wright
W
W
Macfarlane
J C
JC
Whitbourn
L B
LB