2015-05-042015-05-042012-01-24Kosterev, Anatoliy A. and Bachilo, Sergei M., "Resonant optothermoacoustic detection of optical absorption." Patent US8102532B2. issued 2012-01-24. Retrieved from https://hdl.handle.net/1911/80080.https://hdl.handle.net/1911/80080A device comprising an acoustic detector, one or more thermal sensing elements coupled to the acoustic detector, and a light source. A method comprising directing a beam of light at a wavelength at or near one or more thermal sensing elements, wherein the thermal sensing elements are coupled to an acoustic detector, determining a resonance frequency of the acoustic detector, wherein the acoustic detector is coupled to one or more of the thermal sensing elements, and measuring the response of the acoustic detector to detect optical radiation absorption proximate to or at the surface of one or more thermal sensing elements.11 ppengUtility patentUS8102532B2