10.1021/acsphotonics.9b00220.s001 Seungkyu Ha Seungkyu Ha Ying Tang Ying Tang Maarten M. van Oene Maarten M. van Oene Richard Janissen Richard Janissen Roland M. Dries Roland M. Dries Belen Solano Belen Solano Aurèle J. L. Adam Aurèle J. L. Adam Nynke H. Dekker Nynke H. Dekker Single-Crystal Rutile TiO<sub>2</sub> Nanocylinders are Highly Effective Transducers of Optical Force and Torque American Chemical Society 2019 laser powers rutile TiO 2 nanocylinders rutile TiO 2 nanocylinders form Torque Optical Effective Transducers nanoscale spatiotemporal resolution single-crystal rutile TiO 2 material Single-Crystal Rutile TiO 2 Nanocylinders torque transducers Optical Force chemical stability 2019-04-22 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Single-Crystal_Rutile_TiO_sub_2_sub_Nanocylinders_are_Highly_Effective_Transducers_of_Optical_Force_and_Torque/8023604 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<sub>2</sub>, 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<sub>2</sub> 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<sub>2</sub> nanocylinders outperform other materials and offer unprecedented opportunities to expand the control of optical force and torque at the nanoscale.