A multiband infrared detector array, comprising: - a metallic surface (15A, 15B) having a plurality of periodically spaced, resonant apertures in the form of slots formed therein, said metallic surface being separated in distinct portions (15A, 15B), each comprising a corresponding resonant aperture, each resonant aperture resonantly transmitting electromagnetic energy in a distinct frequency band, wherein, for each pixel, said resonant apertures have respective first and second detectors (12A, 12B) associated therewith and positioned under said apertures (14A, 14B), wherein the detector array comprises: a plurality of pixels, each comprising two distinct portions of metallic surface that are separated by an oxide so that the output of each detector may be accessed individually, each distinct portion comprising a single corresponding resonant aperture, wherein said resonant apertures (14A, 14B) have different lengths (L1, L2) and correspond to first and second wavelengths, respectively, the length of each aperture determining a corresponding sub-band frequency filtered through said aperture, wherein each resonant aperture (14A, 14B) collects energy incident on an area larger than said resonant aperture and focuses said incident energy into a smaller localized region within said resonant aperture, the detector associated with said resonant aperture being positioned in said localized region, wherein said first and second detectors comprise mercad telluride, wherein said resonant apertures are sized and arranged such that essentially all of the electromagnetic energy at the first wavelength passes through a first one of said two differently sized resonant apertures onto the first detector and essentially all of the electromagnetic energy at the second wavelength passes through a second one of said two differently sized resonant apertures onto the second detector. - a metallic surface (15A, 15B) having a plurality of periodically spaced, resonant apertures in the form of slots formed therein, said metallic surface being separated in distinct portions (15A, 15B), each comprising a corresponding resonant aperture, each resonant aperture resonantly transmitting electromagnetic energy in a distinct frequency band, wherein, for each pixel, said resonant apertures have respective first and second detectors (12A, 12B) associated therewith and positioned under said apertures (14A, 14B), wherein the detector array comprises: a plurality of pixels, each comprising two distinct portions of metallic surface that are separated by an oxide so that the output of each detector may be accessed individually, each distinct portion comprising a single corresponding resonant aperture, wherein said resonant apertures (14A, 14B) have different lengths (L1, L2) and correspond to first and second wavelengths, respectively, the length of each aperture determining a corresponding sub-band frequency filtered through said aperture, wherein each resonant aperture (14A, 14B) collects energy incident on an area larger than said resonant aperture and focuses said incident energy into a smaller localized region within said resonant aperture, the detector associated with said resonant aperture being positioned in said localized region, wherein said first and second detectors comprise mercad telluride, wherein said resonant apertures are sized and arranged such that essentially all of the electromagnetic energy at the first wavelength passes through a first one of said two differently sized resonant apertures onto the first detector and essentially all of the electromagnetic energy at the second wavelength passes through a second one of said two differently sized resonant apertures onto the second detector.