Here, we report a demonstration of resonant photothermal IR spectroscopy using microstrings in mid-infrared region providing rapid identification of picogram samples. In our microelectromechanical resonant photothermal IR spectroscopy system, samples are deposited directly on microstrings using an in-situ sampling method and the resonance frequency of the string is measured optically. Resonance frequency shifts, proportional to the absorbed heat, are recorded in real time as monochromatic infrared light is being scanned over the mid-infrared range. These resonant photothermal IR spectroscopy spectra, obtained from picogram samples, suggest promising future applications of this approach.
Proceedings of the the 17th International Conference on Solid-state Sensors, Actuators and Microsystems, 2013
absorption; frequency measurement; infrared spectroscopy; micromechanical resonators; microsensors; monochromators; photothermal spectroscopy; Computing and Processing; Engineering Profession; General Topics for Engineers; Geoscience; Nuclear Engineering
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17th International Conference on Solid-State Sensors, Actuators and Microsystems, 2013