Optical tweezer is an optical
device where laser light is used for the fine manipulation of nanosized
particles. Here light is allowed to move
around nanosized particles as well as single atoms. A sharply focused laser
beam is allowed to pass through a lens. Lens focuses the light to a tiny spot
in the specimen. This helps to create an optical trap which is capable of
holding extremely small objects between 10nm and 100 nanometers in size.
Movement and manipulation of these trapped nanoparticles can be done
effectively. The main application of optical tweezers is in the study and
characterization of DNA and proteins. Optical tweezers help scientists to see
the nanoparticles and can be controlled by a computer. Computer controlled
optical tweezers are capable of measuring fine displacements and forcing
circular motion to the nanoparticles.
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