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Significance Infrared (IR) optoacoustic spectroscopy is limited when measuring target molecules in aqueous solution by strong water absorption at IR wavelengths, which reduces detection sensitivity. In this work, we explored the dependence of optoacoustic signal on the temperature of the probed medium and introduced cooled IR optoacoustic spectroscopy (CIROAS) to mute water contributions while performing optoacoustic spectroscopy. We showcase that spectral measurements of proteins, lipids, and glucose in the short-wavelength IR region, performed at 4 °C, lead to marked sensitivity improvements over conventional optoacoustic or IR spectroscopy. CIROAS can enable a spectroscopic approach with high dissemination potential, offering a straightforward way to improve the sensitivity of detection of various molecules in biological samples.

Short-wavelength optoacoustic spectroscopy based on water muting