The temperature of an optically trapped, rotating microparticle
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The measurement of temperature at the mesoscopic scale is challenging but important in a wide variety of research fields, including the investigation of single molecule and cell mechanics and interactions as well as fundamental studies in heat transfer and Brownian dynamics on this scale. In this letter we present a route that determines temperature at the nano- to microscale with three independent measurements performed on a single trapped, rotating luminescent microparticle. We measure temperature changes using both the internal and external degrees of freedom, via (i) the upconverted luminescence, (ii) the rotation rate, and (iii) the Brownian dynamics of the particle. This novel tripartite approach allows us to cross-correlate the temperature for both the internal and external (center-of-mass) degree of freedom for the particle. In addition, our approach provides a measure of the temperature increase without the need of a precise knowledge of the particle dimensions, shape or any previous calibration of the sample or the experimental set-up. The developed technique opens up prospects for stringent tests of nanothermometry.
Rodriguez Sevilla , P , Arita , Y , Liu , X , Jaque , D & Dholakia , K 2018 , ' The temperature of an optically trapped, rotating microparticle ' , ACS Photonics , vol. 5 , no. 9 , pp. 3772-3778 . https://doi.org/10.1021/acsphotonics.8b00822
© 2018, American Chemical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/acsphotonics.8b00822
DescriptionFunding: UK Engineering and Physical Sciences Research Council (EPSRC) for funding through grant EP/P030017/1 (KD).
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