Key points are not available for this paper at this time.
“Smart dust”—small particles of optically encoded microporous Si—can detect organic vapors by measurement of the intensity of reflected light using a laser probe and a detector stationed 20 m away (see Figure and inside front cover). The porous particles absorb condensable vapors, producing a change in refractive index and consequently a quantitative change in optical reflectivity at the wavelength of the laser.
Schmedake et al. (Mon,) studied this question.