You need a semiconductor with a band gap corresponding to these wavelengths: Si, Ge, GaAs? You can look these up and calculate. Basis of remote control devices. My IR machine had a Ge detector as I recall.
Here's what Wikipedia has to say:
"Short-wave infrared: 1.0 to 3 micrometers (from the cut off of silicon to that of the MWIR atmospheric window. InGaAs covers to about 1.8 micrometers; the less sensitive lead salts cover this region."
Other materials that absorb long wavelengths of IR are ionic crystals NaCl windows in IR spectroscopy cut off around 650 cm^-1, KBr at ~450 cm^-1 (but check) (so KBr better but more moisture sensitive). This is because of excitation of lattice vibrations (phonons) that absorb still longer wavelengths (this is physics and I don't know any more!).
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You need a semiconductor with a band gap corresponding to these wavelengths: Si, Ge, GaAs? You can look these up and calculate. Basis of remote control devices. My IR machine had a Ge detector as I recall.
Here's what Wikipedia has to say:
"Short-wave infrared: 1.0 to 3 micrometers (from the cut off of silicon to that of the MWIR atmospheric window. InGaAs covers to about 1.8 micrometers; the less sensitive lead salts cover this region."
http://en.wikipedia.org/wiki/Infrared under sensor response.
Found later: http://en.wikipedia.org/wiki/Infrared_detector
All the info you need!
Other materials that absorb long wavelengths of IR are ionic crystals NaCl windows in IR spectroscopy cut off around 650 cm^-1, KBr at ~450 cm^-1 (but check) (so KBr better but more moisture sensitive). This is because of excitation of lattice vibrations (phonons) that absorb still longer wavelengths (this is physics and I don't know any more!).