Monolithic integration of uncooled PbSe bicolor detectors

• VPD PbSe detector has been monolithically integrated with interference filters.
• We made MWIR uncooled PbSe detector with their spectral response modified by design.
• Bicolor sensor developed detects simultaneously in two infrared bands.
• Uncooled sensor for dual band spectral discrimination for thermal targets is achieved.

We report on the manufacture of a dual band uncooled infrared detector of lead selenide for smart detection of IR emitters. The first advanced bicolor PbSe sensor with its spectral response modified by design for our purpose has been developed by means of the monolithical integration of two high-pass interference filters and polycrystalline PbSe sensors. Wavelength cut-on of the filters was 3.7 and 4.3 μm. Room temperature detectivities of unfiltered lead selenide yield values of D*pk (3.6 μm, 330 Hz, 1 Hz) ∼ 109 cm Hz1/2/W. Considering the excellent properties of this MWIR sensor, the possibility of enhancing it with a selected spectral response opens its use to a wide range of applications.