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 behavior 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 need to be modified with appropriate correction factors to account for the power dissipated by the nanoparticle.
Bibliographical noteFunding Information:
The authors acknowledge funding from the UK Engineering and Physical Sciences Research Council (EPSRC) Grants EP/ J01771X/1 and EP/M000869/1, and K.D. acknowledges support of a Royal Society Leverhulme Trust Senior Fellowship. We thank Professor Takashige Omatsu, Chiba University, for useful discussions.
© 2016 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physics and Astronomy(all)