Remote chemical sensing and recognition by acoustic mapping of photothermal fields
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(Color online) (a) Phase changes of a phthalocyanine containing pellet in the transmission mode under illumination using 600 and interference filters, a mixture of phthalocyanine and NaCl powder at a mass ratio of 5% is cogrinded and pressed to a pellet. The mixture has a strong absorbance at and a weak absorbance at . (b) phase changes of a -type silicon wafer in the reflection mode under illumination using 600 and interference filters, (c) phase changes detected in reflection mode and temperature changes upon illumination using a dye solution filter , and (d) a sample position change equals to 0.0425° phase change for ultrasonic wave in the reflection mode at the sample to transducer distances of 1, 9, and . The optical absorbance is measured on a Beckman-Coulter DU 530 UV-vis spectrometer or a Digilab FTS-60 FTIR spectrometer.
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(Color online) (a) The phase spectrum (bar) and optical absorbance (line) of a rhodamine 6G covered glass slide in the reflection mode, (b) phase changes of a polymer film in the transmission mode using infrared light, (c) phase spectrum (bar) of the polymer film at resolution, and the FTIR spectrum of the film, and (d) the relation between the phase changes and the sample-transducer distances using the dye solution filter ( of ). The laser dyes (from Exciton or Lambda Physik) are selected based on the and dissolved in ethanol with certain absorbance measured in long quartz cuvette: LD 466 (, 2.56), coumarin 480 (, 2.37), coumarin 485 (, 2.82), coumarin 540A (, 2.51), coumarin 153 (, 2.53), DCM (, 2.59), LDS 722 (, 3.04), rhodamine 6G (, 3.59), rhodamine B (, 2.87), sulforhodamine B (, 2.70), sulforhodamine 101 (, 2.52), oxazin 170 (, 2.60), HIDC (, 2.93), oxazin 750 (, 2.84), DTTC (, 0.63), and IR 125 (, 3.1).
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