The optical tweezers principle is based on the discovery that light has momentum. Once a laser beam is encountering an object such as a glass sphere or a cell, the light will be refracted. In the center of the beam, the light will be brighter and more light is refracted from here than...
Standard optical tweezers rely on optical forces arising when a focused laser beam interacts with a microscopic particle: scattering forces, pushing the particle along the beam direction, and gradient forces, attracting it towards the high-intensity focal spot. Importantly, the incoming laser beam is...
Following a brief introduction to working principle of generic optical tweezers, this chapter discusses the manipulation of biological particles using a single beam in LP21 mode, a low-order fiber optic transmission mode. With an intrinsic four-lobed intensity distribution and high coherence, we ...
Developed by Ashkin et al.4, optical tweezers (OTs) have enabled the manipulation of biological systems at the molecular-to-cellular scale. This has led to many seminal studies, including measure- ment of the elastic properties of bacterial flagella5, direct obser- vation of the movement and ...
The first optical trapping of microscopic particles was reported in 1970 by Arthur Ashkin [1,2,3] at Bell Laboratories, who was awarded by the Nobel prize in 2018 for this discovery. Although the underlying physical principle of Optical Tweezers (OT), the so-calledradiation pressure, was known...
Optical Tweezers – Principles and Applications. 2015. Philip H. Jones, Onofrio M. Marago, and Giovani Volpe. Cambridge University Press. Which solutions does MMI offer for Optical Trapping? The MMI CellManipulator optical trapping system enables comfortable, ultra-precise and contact-free manipulation...
When combining a precision moving mechanism with the light source or sample stage, optical tweezers are formed, which can manipulate the microparticle with aid of a computer control system that can measure displacements and induced force. With this approach, it is possible to trap micro- to ...
Optofluidic vortex arrays generated by graphene oxide for tweezers, motors and self-assembly Planar arrays of optofluidic vortices are generated with photothermal gradients from an array of graphene oxide heaters to achieve multiform manipulations. As a tweezer, each vortex can rapidly capture and confine...
Conventional optical tweezers, formed at the diffraction-limited focus of a laser beam, have become a powerful and flexible tool for manipulating micrometre-sized objects. Extending optical trapping down to the nanometre scale would open unprecedented op
(either using two facing optical fibers, or two facing semiconductor lasers) therefore they are relying on a principle different than optical tweezers (which is a single-beam optical trap). However, these approaches are limited to trapping a restricted number of particles; they are unadapted for...