Optical tweezers

Dielectric objects are attracted to the center of the beam, slightly above the beam waist, as described in the text. The force applied on the object depends linearly on its displacement from the trap center just as with a simple spring system.

Ray optics explanation (unfocused laser). When the bead is displaced from the beam center (right image), the larger momentum change of the more intense rays cause a net force to be applied back toward the center of the laser. When the bead is laterally centered on the beam (left image), the resulting lateral force is zero. But an unfocused laser still causes a force pointing away from the laser.

Ray optics explanation (focused laser). In addition to keeping the bead in the center of the laser, a focused laser also keeps the bead in a fixed axial position: The momentum change of the focused rays causes a force towards the laser focus, both when the bead is in front (left image) or behind (right image) the laser focus. So, bead will stay slightly behind the focus, where this force compensates the scattering force.

A generic optical tweezer diagram with only the most basic components.

Optical tweezers (originally called "single-beam gradient force trap") are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch to physically hold and move microscopic dielectric objects similar to tweezers. Optical tweezers have been particularly successful in studying a variety of biological systems in recent years.

单词	Laser tweezers
释义	Laser tweezers 原声例句名人演讲综合 Gerard and I want to add our congratulations to Arthur for his remarkable invention of laser tweezers that can trap living cells and wind up molecular motors. 热拉尔和我想对阿瑟的卓越发明，即激光镊子，表示热烈的祝贺，它的作用是捕获活细胞，并使分子马达运转起来。英语百科 Optical tweezers Optical tweezers (originally called "single-beam gradient force trap") are scientific instruments that use a highly focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch to physically hold and move microscopic dielectric objects similar to tweezers. Optical tweezers have been particularly successful in studying a variety of biological systems in recent years.
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Laser tweezers

Optical tweezers