1.
J Opt Soc Am A Opt Image Sci Vis
; 34(4): 657-665, 2017 Apr 01.
Article
in English
| MEDLINE
| ID: mdl-28375336
ABSTRACT
Zero-contrast gratings (ZCG) can be used to implement narrow bandpass transmission filters. However, they suffer from poor angular tolerance, which hinders their use in pixelated applications. Combining ZCG with double-corrugation grating, we increase the resonance width and angular tolerance of the filter by more than 1 order of magnitude. Filters tunable around 4.6 µm with more than 90% transmission and compatibility with 140 µm pixel size are demonstrated.