Optical manipulation of nanoparticles: a review
TL;DR: In this paper, the authors present several theoretical approaches to calculate the optical forces exerted on trapped nanoparticles and compare them with the results of a single-beam optical trap, and a close look into the key experiments to date demonstrates the feasibility of trapping and provides a grasp of the enormous possibilities that remain to be explored.
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Abstract: Optical trapping is an established field for movement of micron-size objects and cells. However, trapping of metal nanoparticles, nanowires, nanorods and molecules has received little attention. Nanoparticles are more challenging to optically trap and they offer ample new phenomena to explore, for example the plasmon resonance. Resonance and size effects have an impact upon trapping forces that causes nanoparticle trapping to differ from micromanipulation of larger micron-sized objects. There are numerous theoretical approaches to calculate optical forces exerted on trapped nanoparticles. Their combination and comparison gives the reader deeper understanding of the physical processes in an optical trap. A close look into the key experiments to date demonstrates the feasibility of trapping and provides a grasp of the enormous possibilities that remain to be explored. When constructing a single-beam optical trap, particular emphasis has to be placed on the choice of imaging for the trapping and confinement of nanoparticles.
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Citations
Transverse and longitudinal angular momenta of light
Konstantin Y. Bliokh,Franco Nori +1 more
TL;DR: In this article, a theoretical overview of momentum and angular momentum properties of generic optical fields, and methods for their experimental measurements are discussed, and a unified theory of the angular momentum of light based on the canonical momentum and spin densities is presented.
811
Transverse and longitudinal angular momenta of light
Konstantin Y. Bliokh,Franco Nori +1 more
TL;DR: In this article, a theoretical overview of momentum and angular momentum properties of generic optical fields, and methods for their experimental measurements are discussed, and a comprehensive classification of all known optical angular momenta based on their key parameters and main physical properties is presented.
493
Dual electromagnetism: Helicity, spin, momentum, and angular momentum
TL;DR: The dual symmetry between electric and magnetic fields is an important intrinsic property of Maxwell equations in free space as mentioned in this paper, which underlies the conservation of optical helicity and is closely related to the separation of spin and orbital degrees of freedom of light.
Optical trapping and binding
Richard Bowman,Miles J. Padgett +1 more
TL;DR: The underlying theory of optical traps is outlined, and many of the physical observations that have been made in such systems are explored, including 'optical binding', where trapped objects interact with one another through the trapping light field.
385
Internal flows and energy circulation in light beams
TL;DR: In this article, a general description of the internal flows in the coordinate and momentum (angular spectrum) representations for both non-paraxial and paraxial fields is given, which enables one to determine local densities and integral values of the spin and orbital angular momenta of the field.
380
References
Processing carbon nanotubes with holographic optical tweezers
TL;DR: The first demonstration that carbon nanotubes can be trapped and manipulated by optical tweezers is reported, which suggests opportunities for highly parallel nanotube processing with light.
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Optical trapping of nanoparticles and microparticles by a Gaussian standing wave.
TL;DR: Experimental results show that three-dimensional trapping of nanoparticles and microparticles and one or more vertically aligned micro-objects can easily be achieved by use of even highly aberrated beams or objectives with low numerical apertures.
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TL;DR: In this paper, the case of a Rayleigh particle near the focus of a Gaussian laser beam at near-resonant conditions was investigated. And the authors used the classical electromagnetic theory to obtain the dependence of the scattering and gradient forces on the incident laser frequency, the beam convergence angle, and the spatial position of the particle with respect to the focus.
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Optical Trapping of Single-Walled Carbon Nanotubes
TL;DR: In this paper, an infrared laser-trapping system was used to trap and manipulate individually dissolved single-walled carbon nanotubes in an aqueous solution using a microfluidic device.
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Comparison of a high-speed camera and a quadrant detector for measuring displacements in optical tweezers
TL;DR: In this paper, the performance of a high-speed camera and a quadrant detector for measuring the displacement of micron-sized particles in optical tweezers was compared, and the standard deviation of the particle displacements measured by the two techniques showed excellent agreement.
115