An optical detector system

The present invention is directed to an optical detector system, having an infrared detector device; and an optical filter optically coupled to the infrared detector device, wherein the optical filter comprises a dielectric reflective layer capable of reflecting at least 70% of radiation in an undesired wavelength region while transmitting a predetermined proportion of light in a desired wavelength region, wherein the dielectric reflective layer comprises a set of first polymer layers comprising a first polymer in combination with a set of second polymer layers comprising a second polymer having a refractive index different from the first polymer, and further wherein the first polymer layers and the second polymer layers are alternately stacked.