Rotational dynamics and heating of trapped nanovaterite particles
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We synthesize, optically trap and rotate individual nanovaterite crystals with a mean particle radius of 423 nm. Rotation rates of up to 4.9 kHz in heavy water are recorded. Laser-induced heating due to residual absorption of the nanovaterite particle results in the superlinear behaviour of the rotation rate as a function of trap power. A finite element method based on the Navier-Stokes model for the system allows us to determine the residual optical absorption coefficient for a trapped nanovaterite particle. This is further confirmed by the theoretical model. Our data show that the translational Stokes drag force and rotational Stokes drag torque needs to be modified with appropriate correction factors to account for the power dissipated by the nanoparticle.
Arita , Y , Richards , J M , Mazilu , M , Spalding , G C , Skelton Spesyvtseva , S E , Craig , D & Dholakia , K 2016 , ' Rotational dynamics and heating of trapped nanovaterite particles ' , ACS Nano , vol. 10 , no. 12 , pp. 11505-11510 . https://doi.org/10.1021/acsnano.6b07290
© 2016, 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 may differ slightly from the final published version. The final published version of this work is available at pubs.acs.org / https://doi.org/10.1021/acsnano.6b07290
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