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.