Enhanced contrast of wavelength selective Mid-IR detector stable against temperature change

New methods to integrate wavelength selective filter into a thermopile detector using absorbance spectrum of a polymer material and to deposit the absorber selectively onto hot junctions of the thermopile detector are proposed. Hydrophilic absorber solution is selectively deposited on hydrophilic region on the detector. The fabricated detector shows +100% increases from baseline at λ_peak of the absorber. Use of molecular absorption is considered effective to accomplish stable SNR against temperature change.