The article on Optical Tweezers has now been published in the Taylor & Francis Encyclopedia of Optical Engineering.
From the abstract: Optical tweezers are devices that use a single, strongly focused laser
beam for the remote, non-contact trapping and manipulation of
microscopic objects. Since the first demonstration of optical tweezers
in 1986, they have become commonly used across physics, chemistry, and
biology for experiments as diverse as measuring the step size of motor
proteins to a demonstration of fluctuations in entropy production in
microscopic systems. In this entry, the mechanism behind optical
tweezers is introduced, followed by a discussion of practical aspects in
the use of optical tweezers, such as data collection and analysis for
quantitative measurements, and the use of holographic optical traps.
Also, a review of one of the many applications of optical tweezers is
presented, namely, the optical trapping of nanoparticles and
nanostructures and their use for imaging and force sensing.