Single-Crystal Rutile TiO 2 Nanocylinders are Highly Effective Transducers of Optical Force and Torque.

Autor: Ha S; Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands., Tang Y; Optics Research Group, Department of Imaging Physics, Delft University of Technology, van der Waalsweg 8, 2628 CH Delft, The Netherlands., van Oene MM; Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands., Janissen R; Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands., Dries RM; Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands., Solano B; Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands., Adam AJL; Optics Research Group, Department of Imaging Physics, Delft University of Technology, van der Waalsweg 8, 2628 CH Delft, The Netherlands., Dekker NH; Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, van der Maasweg 9, 2629 HZ Delft, The Netherlands.
Jazyk: angličtina
Zdroj: ACS photonics [ACS Photonics] 2019 May 15; Vol. 6 (5), pp. 1255-1265. Date of Electronic Publication: 2019 Apr 22.
DOI: 10.1021/acsphotonics.9b00220
Abstrakt: Optical trapping of (sub)micron-sized particles is broadly employed in nanoscience and engineering. The materials commonly employed for these particles, however, have physical properties that limit the transfer of linear or angular momentum (or both). This reduces the magnitude of forces and torques, and the spatiotemporal resolution, achievable in linear and angular traps. Here, we overcome these limitations through the use of single-crystal rutile TiO 2 , which has an exceptionally large optical birefringence, a high index of refraction, good chemical stability, and is amenable to geometric control at the nanoscale. We show that rutile TiO 2 nanocylinders form powerful joint force and torque transducers in aqueous environments by using only moderate laser powers to apply nN·nm torques at kHz rotational frequencies to tightly trapped particles. In doing so, we demonstrate how rutile TiO 2 nanocylinders outperform other materials and offer unprecedented opportunities to expand the control of optical force and torque at the nanoscale.
Competing Interests: The authors declare no competing financial interest.
Databáze: MEDLINE
Externí odkaz: