It has been over 20 years since the pioneering work of Arthur Ashkin, and in the intervening
years, the field of optical tweezers has grown tremendously. Optical tweezers are now being …

Since the time of their introduction, optical tweezers (OTs) have grown to be a powerful tool
in the hands of biologists. OTs use highly focused laser light to guide, manipulate, or sort …

For a physicist, and more generally for a scientist, one of the pleasures in everyday life is to
detect exemplifying manifestations and avatars of the topic he is working on. Why do small …

Here, recent significant developments are reviewed in manipulating soft matter systems
through the use of magnetic torque. Magnetic torque enables the orientation, assembly, and …

An optically trapped Brownian particle is a sensitive probe of molecular and nanoscopic
forces. An understanding of its motion, which is caused by the interplay of random and …

In cells, RNA polymerase (RNAP) must transcribe supercoiled DNA, whose torsional state is
constantly changing, but how RNAP deals with DNA supercoiling remains elusive. We report …

We describe a toolbox, implemented in Matlab, for the computational modelling of optical
tweezers. The toolbox is designed for the calculation of optical forces and torques, and can …

We describe an apparatus that can measure the instantaneous angular displacement and
torque applied to a quartz particle which is angularly trapped. Torque is measured by …

We demonstrate an optical system that can apply and accurately measure the torque
exerted by the trapping beam on a rotating birefringent probe particle. This allows the …

The T-matrix method is one of the most powerful and widely used theoretical techniques for
the computation of electromagnetic scattering by single and composite particles, discrete …